diff --git a/easybuild/easyconfigs/a/ant/ant-1.10.9-Java-11.eb b/easybuild/easyconfigs/a/ant/ant-1.10.9-Java-11.eb
new file mode 100644
index 00000000000..38788b67f40
--- /dev/null
+++ b/easybuild/easyconfigs/a/ant/ant-1.10.9-Java-11.eb
@@ -0,0 +1,27 @@
+easyblock = 'PackedBinary'
+
+name = 'ant'
+version = '1.10.9'
+versionsuffix = '-Java-%(javaver)s'
+
+homepage = 'https://ant.apache.org/'
+description = """Apache Ant is a Java library and command-line tool whose mission is to drive processes described in
+ build files as targets and extension points dependent upon each other. The main known usage of Ant is the build of
+ Java applications."""
+
+toolchain = SYSTEM
+
+source_urls = ['https://archive.apache.org/dist/ant/binaries/']
+sources = ['apache-%(name)s-%(version)s-bin.tar.gz']
+checksums = ['5f8a85ddee6effe79163aa54c7bef6b60305e37200dedc1986437fb5c072a9f3']
+
+dependencies = [('Java', '11')]
+
+sanity_check_paths = {
+    'files': ['bin/ant', 'lib/ant.jar'],
+    'dirs': [],
+}
+
+modextravars = {'ANT_HOME': '%(installdir)s'}
+
+moduleclass = 'devel'
diff --git a/easybuild/easyconfigs/o/OpenCV/OpenCV-4.5.1-foss-2020b-contrib.eb b/easybuild/easyconfigs/o/OpenCV/OpenCV-4.5.1-foss-2020b-contrib.eb
new file mode 100644
index 00000000000..82699bcc1ef
--- /dev/null
+++ b/easybuild/easyconfigs/o/OpenCV/OpenCV-4.5.1-foss-2020b-contrib.eb
@@ -0,0 +1,69 @@
+name = 'OpenCV'
+version = '4.5.1'
+versionsuffix = '-contrib'
+
+# the hash is version dependent! see 3rdparty/ippicv/ippicv.cmake
+local_ippicv_hash = 'a56b6ac6f030c312b2dce17430eef13aed9af274'
+
+homepage = 'https://opencv.org/'
+description = """OpenCV (Open Source Computer Vision Library) is an open source computer vision
+ and machine learning software library. OpenCV was built to provide
+ a common infrastructure for computer vision applications and to accelerate
+ the use of machine perception in the commercial products.
+ Includes extra modules for OpenCV from the contrib repository."""
+
+toolchain = {'name': 'foss', 'version': '2020b'}
+
+sources = [
+    {'source_urls': ['https://github.com/opencv/opencv/archive/'],
+     'download_filename': '%(version)s.zip', 'filename': SOURCELOWER_ZIP},
+    {'source_urls': ['https://github.com/opencv/opencv_contrib/archive/'],
+     'download_filename': '%(version)s.zip', 'filename': '%(namelower)s_contrib-%(version)s.zip'},
+    {'source_urls': ['https://raw.githubusercontent.com/opencv/opencv_3rdparty/%s/ippicv' % local_ippicv_hash],
+     'filename': 'ippicv_2020_lnx_intel64_20191018_general.tgz', 'extract_cmd': "cp %s %(builddir)s"},
+]
+checksums = [
+    '5fbc26ee09e148a4d494b225d04217f7c913ca1a4d46115b70cca3565d7bbe05',  # opencv-4.5.1.zip
+    'fdbd851985fd79797a04e16bdd672aff698aee89086b944295c90265f3cfffda',  # opencv_contrib-4.5.1.zip
+    '08627fa5660d52d59309a572dd7db5b9c8aea234cfa5aee0942a1dd903554246',  # ippicv_2020_lnx_intel64_20191018_general.tgz
+]
+
+builddependencies = [
+    ('CMake', '3.18.4'),
+]
+
+dependencies = [
+    ('Python', '3.8.6'),
+    ('SciPy-bundle', '2020.11'),  # for numpy
+    ('zlib', '1.2.11'),
+    ('FFmpeg', '4.3.1'),
+    ('libjpeg-turbo', '2.0.5'),
+    ('libpng', '1.6.37'),
+    ('LibTIFF', '4.1.0'),
+    ('libwebp', '1.1.0'),
+    ('OpenEXR', '2.5.5'),
+    ('JasPer', '2.0.24'),
+    ('Java', '11', '', True),
+    ('ant', '1.10.9', '-Java-%(javaver)s', True),
+    ('GLib', '2.66.1'),
+    ('GTK+', '3.24.23'),
+    ('HDF5', '1.10.7'),  # needed by hdf from contrib
+]
+
+configopts = '-DOPENCV_EXTRA_MODULES_PATH=%(builddir)s/%(namelower)s_contrib-%(version)s/modules'
+
+enhance_sanity_check = True
+
+local_contrib_libs = [
+    'aruco', 'bgsegm', 'bioinspired', 'ccalib', 'datasets', 'dnn_objdetect', 'dnn_superres', 'dpm', 'face', 'freetype',
+    'fuzzy', 'hdf', 'hfs', 'img_hash', 'line_descriptor', 'optflow', 'phase_unwrapping', 'plot', 'quality', 'reg',
+    'rgbd', 'saliency', 'shape', 'stereo', 'structured_light', 'superres', 'surface_matching', 'text', 'tracking',
+    'videostab', 'xfeatures2d', 'ximgproc', 'xobjdetect', 'xphoto'
+]
+
+sanity_check_paths = {
+    'files': ['lib64/libopencv_%s.%s' % (l, SHLIB_EXT) for l in local_contrib_libs],
+    'dirs': [],
+}
+
+moduleclass = 'vis'
diff --git a/easybuild/easyconfigs/o/OpenEXR/OpenEXR-2.5.5-GCCcore-10.2.0.eb b/easybuild/easyconfigs/o/OpenEXR/OpenEXR-2.5.5-GCCcore-10.2.0.eb
new file mode 100644
index 00000000000..179dd3fa79b
--- /dev/null
+++ b/easybuild/easyconfigs/o/OpenEXR/OpenEXR-2.5.5-GCCcore-10.2.0.eb
@@ -0,0 +1,31 @@
+easyblock = 'CMakeMake'
+
+name = 'OpenEXR'
+version = '2.5.5'
+
+homepage = 'https://www.openexr.com/'
+description = """OpenEXR is a high dynamic-range (HDR) image file format developed by Industrial Light & Magic
+ for use in computer imaging applications"""
+
+toolchain = {'name': 'GCCcore', 'version': '10.2.0'}
+
+source_urls = ['https://github.com/openexr/openexr/archive/']
+sources = ['v%(version)s.tar.gz']
+checksums = ['59e98361cb31456a9634378d0f653a2b9554b8900f233450f2396ff495ea76b3']
+
+builddependencies = [
+    ('binutils', '2.35'),
+    ('CMake', '3.18.4'),
+]
+
+configopts = '-DOPENEXR_BUILD_PYTHON_LIBS=OFF'
+
+sanity_check_paths = {
+    'files': ['lib/lib%s-%%(version_major)s_%%(version_minor)s.%s' % (x, SHLIB_EXT) for x in
+              ['Half', 'Iex', 'IexMath', 'IlmImf', 'IlmImfUtil', 'IlmThread', 'Imath']] +
+             ['bin/exr%s' % x for x in
+              ['envmap', 'header', 'makepreview', 'maketiled', 'multipart', 'multiview', 'stdattr']],
+    'dirs': ['include/OpenEXR', 'share'],
+}
+
+moduleclass = 'vis'