FediRoster is a web application for hosting an opt-in public list of fediverse accounts. Its purpose is to assist communities to more easily find people with shared interests on Mastodon and other connected platforms. People are able to add themselves to the list via proof of account ownership.
Kaleidoscribe is a web-based alternative YouTube client that allows you to subscribe to channels and playlists without a Google/YouTube account. It crawls the YouTube website in the background to give you a relatively up-to-date view of your customized subscription feed.
KontakteDB is a graphical application for storing and managing contact details. It also stores photos and business cards, synchronizes with Android devices and CalDAV calendars (for birthdays) and imports/exports vCard files.
MiniLockbox is a simple and tiny self-hosted Dropbox clone that synchronizes one directory between clients. Files are end-to-end encrypted between clients, so the central server does not need to be trusted.
Pinhole is a tiny single-user Bluesky→ActivityPub one-way bridge. It can be self-hosted to provide a mirror bot for exactly one Bluesky profile followable by exactly one ActivityPub (e.g. Mastodon) account.