diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000..fcadb2cf97
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text eol=lf
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 25148a0e56..0000000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,77 +0,0 @@
-# AppVeyor.com is a Continuous Integration service to build and run tests under
-# Windows
-# https://ci.appveyor.com/project/tmylk/gensim
-
-environment:
-  global:
-    # SDK v7.0 MSVC Express 2008's SetEnv.cmd script will fail if the
-    # /E:ON and /V:ON options are not enabled in the batch script intepreter
-    # See: http://stackoverflow.com/a/13751649/163740
-    CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\continuous_integration\\appveyor\\run_with_env.cmd"
-    WHEELHOUSE_UPLOADER_USERNAME: "Lev.Konstantinovskiy"
-    WHEELHOUSE_UPLOADER_SECRET:
-      secure: qXqY3dFmLOqvxa3Om2gQi/BjotTOK+EP2IPLolBNo0c61yDtNWxbmE4wH3up72Be
-    TOX_PARALLEL_NO_SPINNER: 1
-
-  matrix:
-# Python 3.8 builds on Appveyor/Windows failing; commented-out for now pending resolution
-# see comment at <https://github.com/RaRe-Technologies/gensim/pull/2715#issuecomment-569457589>
-#    - PYTHON: "C:\\Python38-x64"
-#      PYTHON_VERSION: "3.8.1"
-#      PYTHON_ARCH: "64"
-#      TOXENV: "py38-win"
-
-    - PYTHON: "C:\\Python37-x64"
-      PYTHON_VERSION: "3.7.6"
-      PYTHON_ARCH: "64"
-      TOXENV: "py37-win"
-
-    - PYTHON: "C:\\Python36-x64"
-      PYTHON_VERSION: "3.6.10"
-      PYTHON_ARCH: "64"
-      TOXENV: "py36-win"
-
-init:
-  - "ECHO %PYTHON% %PYTHON_VERSION% %PYTHON_ARCH%"
-  - "ECHO \"%APPVEYOR_SCHEDULED_BUILD%\""
-  # If there is a newer build queued for the same PR, cancel this one.
-  # The AppVeyor 'rollout builds' option is supposed to serve the same
-  # purpose but it is problematic because it tends to cancel builds pushed
-  # directly to master instead of just PR builds (or the converse).
-  # credits: JuliaLang developers.
-  - ps: if ($env:APPVEYOR_PULL_REQUEST_NUMBER -and $env:APPVEYOR_BUILD_NUMBER -ne ((Invoke-RestMethod `
-        https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG/history?recordsNumber=50).builds | `
-        Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
-          Write-Host "There are newer queued builds for this pull request, skipping build."
-          Exit-AppveyorBuild
-        }
-
-install:
-  # Install Python (from the official .msi of http://python.org) and pip when
-  # not already installed.
-  - "powershell ./continuous_integration/appveyor/install.ps1"
-  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
-  - "python -m pip install -U pip tox"
-
-  # Next line only to demo that py3.8-on-Appveyor *could* install Cython from wheel just fine,
-  # despite mysterious following attempt/failure to build-and-use Cython on that one Appveyor config.
-  # Delete when py3.8-on-Appveyor starts working normally,
-  # see comment at <https://github.com/RaRe-Technologies/gensim/pull/2715#issuecomment-569457589>
-  - "python -m pip install Cython==0.29.14 numpy==1.18.0"
-
-  # Check that we have the expected versions and architecture
-  - "pip --version"
-  - "python --version"
-  - "python -c \"import struct; print(struct.calcsize('P') * 8)\""
-
-build: false
-
-test_script:
-  - tox -vv
-
-cache:
-  # Use the appveyor cache to avoid re-downloading large archives such
-  # the MKL numpy and scipy wheels mirrored on a rackspace cloud
-  # container, speed up the appveyor jobs and reduce bandwidth
-  # usage on our rackspace account.
-  - '%APPDATA%\pip\Cache'
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 7cd08a8f94..c624e7e3e9 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -1,7 +1,3 @@
-trigger:
-- master
-- develop
-
 pool:
   vmImage: 'vs2017-win2016'
 
diff --git a/continuous_integration/appveyor/install.ps1 b/continuous_integration/appveyor/install.ps1
deleted file mode 100644
index 88c6c1ec9c..0000000000
--- a/continuous_integration/appveyor/install.ps1
+++ /dev/null
@@ -1,231 +0,0 @@
-# Sample script to install Python and pip under Windows
-# Authors: Olivier Grisel, Jonathan Helmus, Kyle Kastner, and Alex Willmer
-# License: CC0 1.0 Universal: http://creativecommons.org/publicdomain/zero/1.0/
-
-$MINICONDA_URL = "http://repo.continuum.io/miniconda/"
-$BASE_URL = "https://www.python.org/ftp/python/"
-$GET_PIP_URL = "https://bootstrap.pypa.io/get-pip.py"
-$GET_PIP_PATH = "C:\get-pip.py"
-
-$PYTHON_PRERELEASE_REGEX = @"
-(?x)
-(?<major>\d+)
-\.
-(?<minor>\d+)
-\.
-(?<micro>\d+)
-(?<prerelease>[a-z]{1,2}\d+)
-"@
-
-
-function Download ($filename, $url) {
-    $webclient = New-Object System.Net.WebClient
-
-    $basedir = $pwd.Path + "\"
-    $filepath = $basedir + $filename
-    if (Test-Path $filename) {
-        Write-Host "Reusing" $filepath
-        return $filepath
-    }
-
-    # Download and retry up to 3 times in case of network transient errors.
-    Write-Host "Downloading" $filename "from" $url
-    $retry_attempts = 2
-    for ($i = 0; $i -lt $retry_attempts; $i++) {
-        try {
-            $webclient.DownloadFile($url, $filepath)
-            break
-        }
-        Catch [Exception]{
-            Start-Sleep 1
-        }
-    }
-    if (Test-Path $filepath) {
-        Write-Host "File saved at" $filepath
-    } else {
-        # Retry once to get the error message if any at the last try
-        $webclient.DownloadFile($url, $filepath)
-    }
-    return $filepath
-}
-
-
-function ParsePythonVersion ($python_version) {
-    if ($python_version -match $PYTHON_PRERELEASE_REGEX) {
-        return ([int]$matches.major, [int]$matches.minor, [int]$matches.micro,
-                $matches.prerelease)
-    }
-    $version_obj = [version]$python_version
-    return ($version_obj.major, $version_obj.minor, $version_obj.build, "")
-}
-
-
-function DownloadPython ($python_version, $platform_suffix) {
-    $major, $minor, $micro, $prerelease = ParsePythonVersion $python_version
-
-    if (($major -le 2 -and $micro -eq 0) `
-        -or ($major -eq 3 -and $minor -le 2 -and $micro -eq 0) `
-        ) {
-        $dir = "$major.$minor"
-        $python_version = "$major.$minor$prerelease"
-    } else {
-        $dir = "$major.$minor.$micro"
-    }
-
-    if ($prerelease) {
-        if (($major -le 2) `
-            -or ($major -eq 3 -and $minor -eq 1) `
-            -or ($major -eq 3 -and $minor -eq 2) `
-            -or ($major -eq 3 -and $minor -eq 3) `
-            ) {
-            $dir = "$dir/prev"
-        }
-    }
-
-    if (($major -le 2) -or ($major -le 3 -and $minor -le 4)) {
-        $ext = "msi"
-        if ($platform_suffix) {
-            $platform_suffix = ".$platform_suffix"
-        }
-    } else {
-        $ext = "exe"
-        if ($platform_suffix) {
-            $platform_suffix = "-$platform_suffix"
-        }
-    }
-
-    $filename = "python-$python_version$platform_suffix.$ext"
-    $url = "$BASE_URL$dir/$filename"
-    $filepath = Download $filename $url
-    return $filepath
-}
-
-
-function InstallPython ($python_version, $architecture, $python_home) {
-    Write-Host "Installing Python" $python_version "for" $architecture "bit architecture to" $python_home
-    if (Test-Path $python_home) {
-        Write-Host $python_home "already exists, skipping."
-        return $false
-    }
-    if ($architecture -eq "32") {
-        $platform_suffix = ""
-    } else {
-        $platform_suffix = "amd64"
-    }
-    $installer_path = DownloadPython $python_version $platform_suffix
-    $installer_ext = [System.IO.Path]::GetExtension($installer_path)
-    Write-Host "Installing $installer_path to $python_home"
-    $install_log = $python_home + ".log"
-    if ($installer_ext -eq '.msi') {
-        InstallPythonMSI $installer_path $python_home $install_log
-    } else {
-        InstallPythonEXE $installer_path $python_home $install_log
-    }
-    if (Test-Path $python_home) {
-        Write-Host "Python $python_version ($architecture) installation complete"
-    } else {
-        Write-Host "Failed to install Python in $python_home"
-        Get-Content -Path $install_log
-        Exit 1
-    }
-}
-
-
-function InstallPythonEXE ($exepath, $python_home, $install_log) {
-    $install_args = "/quiet InstallAllUsers=1 TargetDir=$python_home"
-    RunCommand $exepath $install_args
-}
-
-
-function InstallPythonMSI ($msipath, $python_home, $install_log) {
-    $install_args = "/qn /log $install_log /i $msipath TARGETDIR=$python_home"
-    $uninstall_args = "/qn /x $msipath"
-    RunCommand "msiexec.exe" $install_args
-    if (-not(Test-Path $python_home)) {
-        Write-Host "Python seems to be installed else-where, reinstalling."
-        RunCommand "msiexec.exe" $uninstall_args
-        RunCommand "msiexec.exe" $install_args
-    }
-}
-
-function RunCommand ($command, $command_args) {
-    Write-Host $command $command_args
-    Start-Process -FilePath $command -ArgumentList $command_args -Wait -Passthru
-}
-
-
-function InstallPip ($python_home) {
-    $pip_path = $python_home + "\Scripts\pip.exe"
-    $python_path = $python_home + "\python.exe"
-    if (-not(Test-Path $pip_path)) {
-        Write-Host "Installing pip..."
-        $webclient = New-Object System.Net.WebClient
-        $webclient.DownloadFile($GET_PIP_URL, $GET_PIP_PATH)
-        Write-Host "Executing:" $python_path $GET_PIP_PATH
-        & $python_path $GET_PIP_PATH
-    } else {
-        Write-Host "pip already installed."
-    }
-    RunCommand $pip_path "install --upgrade pip"
-    RunCommand $python_path "-m pip install --upgrade pip"
-}
-
-
-function DownloadMiniconda ($python_version, $platform_suffix) {
-    if ($python_version -eq "3.4") {
-        $filename = "Miniconda3-3.5.5-Windows-" + $platform_suffix + ".exe"
-    } else {
-        $filename = "Miniconda-3.5.5-Windows-" + $platform_suffix + ".exe"
-    }
-    $url = $MINICONDA_URL + $filename
-    $filepath = Download $filename $url
-    return $filepath
-}
-
-
-function InstallMiniconda ($python_version, $architecture, $python_home) {
-    Write-Host "Installing Python" $python_version "for" $architecture "bit architecture to" $python_home
-    if (Test-Path $python_home) {
-        Write-Host $python_home "already exists, skipping."
-        return $false
-    }
-    if ($architecture -eq "32") {
-        $platform_suffix = "x86"
-    } else {
-        $platform_suffix = "x86_64"
-    }
-    $filepath = DownloadMiniconda $python_version $platform_suffix
-    Write-Host "Installing" $filepath "to" $python_home
-    $install_log = $python_home + ".log"
-    $args = "/S /D=$python_home"
-    Write-Host $filepath $args
-    Start-Process -FilePath $filepath -ArgumentList $args -Wait -Passthru
-    if (Test-Path $python_home) {
-        Write-Host "Python $python_version ($architecture) installation complete"
-    } else {
-        Write-Host "Failed to install Python in $python_home"
-        Get-Content -Path $install_log
-        Exit 1
-    }
-}
-
-
-function InstallMinicondaPip ($python_home) {
-    $pip_path = $python_home + "\Scripts\pip.exe"
-    $conda_path = $python_home + "\Scripts\conda.exe"
-    if (-not(Test-Path $pip_path)) {
-        Write-Host "Installing pip..."
-        $args = "install --yes pip"
-        Write-Host $conda_path $args
-        Start-Process -FilePath "$conda_path" -ArgumentList $args -Wait -Passthru
-    } else {
-        Write-Host "pip already installed."
-    }
-}
-
-function main () {
-    InstallPython $env:PYTHON_VERSION $env:PYTHON_ARCH $env:PYTHON
-    InstallPip $env:PYTHON
-}
-
-main
diff --git a/continuous_integration/appveyor/requirements.txt b/continuous_integration/appveyor/requirements.txt
deleted file mode 100644
index b422707968..0000000000
--- a/continuous_integration/appveyor/requirements.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-cython
-six >= 1.5.0
-smart_open >= 1.2.1
-nose
-wheel
-wheelhouse_uploader
diff --git a/continuous_integration/appveyor/run_with_env.cmd b/continuous_integration/appveyor/run_with_env.cmd
deleted file mode 100644
index 5da547c499..0000000000
--- a/continuous_integration/appveyor/run_with_env.cmd
+++ /dev/null
@@ -1,88 +0,0 @@
-:: To build extensions for 64 bit Python 3, we need to configure environment
-:: variables to use the MSVC 2010 C++ compilers from GRMSDKX_EN_DVD.iso of:
-:: MS Windows SDK for Windows 7 and .NET Framework 4 (SDK v7.1)
-::
-:: To build extensions for 64 bit Python 2, we need to configure environment
-:: variables to use the MSVC 2008 C++ compilers from GRMSDKX_EN_DVD.iso of:
-:: MS Windows SDK for Windows 7 and .NET Framework 3.5 (SDK v7.0)
-::
-:: 32 bit builds, and 64-bit builds for 3.5 and beyond, do not require specific
-:: environment configurations.
-::
-:: Note: this script needs to be run with the /E:ON and /V:ON flags for the
-:: cmd interpreter, at least for (SDK v7.0)
-::
-:: More details at:
-:: https://github.com/cython/cython/wiki/64BitCythonExtensionsOnWindows
-:: http://stackoverflow.com/a/13751649/163740
-::
-:: Author: Olivier Grisel
-:: License: CC0 1.0 Universal: http://creativecommons.org/publicdomain/zero/1.0/
-::
-:: Notes about batch files for Python people:
-::
-:: Quotes in values are literally part of the values:
-::      SET FOO="bar"
-:: FOO is now five characters long: " b a r "
-:: If you don't want quotes, don't include them on the right-hand side.
-::
-:: The CALL lines at the end of this file look redundant, but if you move them
-:: outside of the IF clauses, they do not run properly in the SET_SDK_64==Y
-:: case, I don't know why.
-@ECHO OFF
-
-SET COMMAND_TO_RUN=%*
-SET WIN_SDK_ROOT=C:\Program Files\Microsoft SDKs\Windows
-SET WIN_WDK=c:\Program Files (x86)\Windows Kits\10\Include\wdf
-
-:: Extract the major and minor versions, and allow for the minor version to be
-:: more than 9.  This requires the version number to have two dots in it.
-SET MAJOR_PYTHON_VERSION=%PYTHON_VERSION:~0,1%
-IF "%PYTHON_VERSION:~3,1%" == "." (
-    SET MINOR_PYTHON_VERSION=%PYTHON_VERSION:~2,1%
-) ELSE (
-    SET MINOR_PYTHON_VERSION=%PYTHON_VERSION:~2,2%
-)
-
-:: Based on the Python version, determine what SDK version to use, and whether
-:: to set the SDK for 64-bit.
-IF %MAJOR_PYTHON_VERSION% == 2 (
-    SET WINDOWS_SDK_VERSION="v7.0"
-    SET SET_SDK_64=Y
-) ELSE (
-    IF %MAJOR_PYTHON_VERSION% == 3 (
-        SET WINDOWS_SDK_VERSION="v7.1"
-        IF %MINOR_PYTHON_VERSION% LEQ 4 (
-            SET SET_SDK_64=Y
-        ) ELSE (
-            SET SET_SDK_64=N
-            IF EXIST "%WIN_WDK%" (
-                :: See: https://connect.microsoft.com/VisualStudio/feedback/details/1610302/
-                REN "%WIN_WDK%" 0wdf
-            )
-        )
-    ) ELSE (
-        ECHO Unsupported Python version: "%MAJOR_PYTHON_VERSION%"
-        EXIT 1
-    )
-)
-
-IF %PYTHON_ARCH% == 64 (
-    IF %SET_SDK_64% == Y (
-        ECHO Configuring Windows SDK %WINDOWS_SDK_VERSION% for Python %MAJOR_PYTHON_VERSION% on a 64 bit architecture
-        SET DISTUTILS_USE_SDK=1
-        SET MSSdk=1
-        "%WIN_SDK_ROOT%\%WINDOWS_SDK_VERSION%\Setup\WindowsSdkVer.exe" -q -version:%WINDOWS_SDK_VERSION%
-        "%WIN_SDK_ROOT%\%WINDOWS_SDK_VERSION%\Bin\SetEnv.cmd" /x64 /release
-        ECHO Executing: %COMMAND_TO_RUN%
-        call %COMMAND_TO_RUN% || EXIT 1
-    ) ELSE (
-        ECHO Using default MSVC build environment for 64 bit architecture
-        ECHO Executing: %COMMAND_TO_RUN%
-        call %COMMAND_TO_RUN% || EXIT 1
-    )
-) ELSE (
-    ECHO Using default MSVC build environment for 32 bit architecture
-    ECHO Executing: %COMMAND_TO_RUN%
-    call %COMMAND_TO_RUN% || EXIT 1
-)
diff --git a/setup.py b/setup.py
index 86d1534ed8..09607d951a 100644
--- a/setup.py
+++ b/setup.py
@@ -264,7 +264,6 @@ def run(self):
     'testfixtures',
     'Morfessor==2.0.2a4',
     'python-Levenshtein >= 0.10.2',
-    'visdom >= 0.1.8, != 0.1.8.7',
     'scikit-learn',
     # The following packages are commented out because they don't install on Windows. So skip the
     # related tests in AppVeyor. We still test them in Linux via Travis, see linux_testenv below.
@@ -282,7 +281,8 @@ def run(self):
 #
 #   https://packaging.python.org/discussions/install-requires-vs-requirements/
 #
-docs_testenv = win_testenv + distributed_env + [
+visdom_req = ['visdom >= 0.1.8, != 0.1.8.7']
+docs_testenv = win_testenv + distributed_env + visdom_req + [
     'sphinx <= 2.4.4',  # avoid `sphinx >= 3.0` that breaks the build
     'sphinx-gallery',
     'sphinxcontrib.programoutput',
@@ -308,7 +308,7 @@ def run(self):
 
 # Add additional requirements for testing on Linux. We skip some tests on Windows,
 # because the libraries below are too tricky to install there.
-linux_testenv = win_testenv[:]
+linux_testenv = win_testenv[:] + visdom_req
 if sys.version_info >= (3, 7):
     # HACK: Installing tensorflow causes a segfault in Travis on py3.6. Other Pythons work – a mystery.
     # See https://github.com/RaRe-Technologies/gensim/pull/2814#issuecomment-621477948