Free and open source. Installed per user, so no administrator rights are needed on any of the three platforms. Every build is on the releases page.
Run the setup program from the releases page. It installs for the current user under your local application data, offers Desktop and Start Menu shortcuts and registers itself so it uninstalls the ordinary way.
Windows may show a SmartScreen warning the first time, because the installer is not code signed. Why that happens, then how to proceed safely.
A Flatpak bundle is on the releases page. It runs sandboxed, with access to your home folder so it can read your skills, plus network access for the update check and nothing else.
A disk image is on the releases page. Drag the application to your Applications folder.
Python 3.11 or newer, then:
git clone https://github.com/oernster/SkillsViewer.git
cd SkillsViewer
python -m pip install -r requirements.txt
python main.pyThe user interface is under LGPL-3.0. Everything beneath it, along with the setup program and the build scripts, is under GPL-3.0. Both texts ship with the application and both are reachable from the buttons in its bottom tray.