They added encryption in v5 alpha, but it also has a bunch of issues like memory leaks, so it's not ready for daily use yet.
Fractal. The published version is outdated and has no encryption support, so I'm rather waiting for a major update.
IMO sandbox games are games in which players have the freedom to do things that make gameplay non-linear, such as exploring the world or building structures. Sandbox games can also be based entirely on player creativity, like creating levels or even entire game modes (or games) within a game
Lemmy is the backend (server-side code) and lemmy-ui is the frontend (client-side code that runs in your browser). The first one is used for installation, the repository has links to instructions
Because it's GNU/Linux 🧔♀️