PostmarketOS to actually own your phone.
Syncthing, a peer to peer file synchronize that basically everyone needs, they just don’t know it.
Paperless-ngx that allows you to self host an easily browseable archive of your documents. Fully featured with OCR, ML-powered categorization and the works.
Jitsi - Open-source and self-hosted video conference platform. You can even try it directly on their website.
IPFS - A distributed file sharing technology which is wonderful for file or site hosting (edit: wether it is uncensorable is open for debate)
Rust - A programming language and a powerful compiler that creates compiled memory-safe programs and can be used nearly everywhere
Fedora + KDE - A combination of a stable modern OS and a complete desktop environment
Wine - launch Windows programs on the latter
Lemmy
Bonus : AlternativeTo to find good open-source alternative software
