jfrog.io has served the Feel++ Debian packages for a short time but the service could not scale to our needs We have moved the service to http://apt.feelpp.org and updated our procedure
For example for Ubuntu Focal 20.04, follow these steps to get the Feel++ core toolboxes and mor packages
make sure to be root or use sudo
wget -qO - http://apt.feelpp.org/apt.gpg | gpg --dearmor > feelpp.gpg;
install -o root -g root -m 644 feelpp.gpg /etc/apt/trusted.gpg.d;
echo "deb [signed-by=/etc/apt/trusted.gpg.d/feelpp.gpg] http://apt.feelpp.org/ubuntu focal latest" | tee -a /etc/apt/sources.list.d/feelpp.list;
apt update
apt install 'feelpp-toolboxes*'
apt install 'python3-feelpp-toolboxes*'
Debian packages for focal are automatically generated when new commits are done in the develop branch and then part of the latest distribution channel. When a release is done, the master branch is updated and Debian packages for focal are generated for the stable distribution channel. Of course, Debian packages can be used in Windows 10 thanks to WSL and the installation of a subsystem like focal.
More details are available here.