Heroic is a cross-platform launcher for Steam, Epic, GOG, and Amazon, featuring a game library, filters, Wine-based installation, and interface customization.
PearPass is a free password manager with cloudless P2P synchronization. It’s cross-platform, but still rough around the edges and requires a desktop app for syncing.
Control D is a service that allows you to create your own DNS with website blocking rules, configure filters, and connect devices for parental control.
copyparty is a Python script that lets you quickly launch an FTP server with a web interface — no installation required, supporting resume and multiple protocols.
morgen combines calendars, tasks, and calls from various services into a single window, making it easier to plan and manage your time across all platforms.