ConverTube can download and convert up to 5 videos at the same time. Made with the PyQT GUI toolkit with multithreading to allow for simultaneous downloading and converting. Must have Python 3 installed to your device.
To install this app using python, on Windows type open your terminal and type python setup.py install
Linux devices type sudo python3 setup.py install
Downloading multiple videos at the same time may slow down your internet connection. Also, converting up to 5 videos at once may cause your computer to slow down. This app is written in Python which naturally has a slow runtime speed. So conversion time won't be the fastest. You will need ffmpeg installed to your device.