Akkoma is a federated, ActivityPub-compatible social media service written with Elixir, compatible with the Mastodon API.
Synapse is a federated, fully end-to-end encrypted messaging platform built on top of the Matrix protocol.
Federated Encrypted Messaging
Bitwarden is an end-to-end encrypted password management solution, with support for TOTP and secure notes. It can be used to keep secrets and credentials in a safe place without third parties being able to view them.
Encrypted Password Manager
The Nextcloud suite allows you to completely replace proprietary cloud services with a FOSS, federated alternative. Nextcloud allows you to host files, share, use online word processing, sync your calendars and more.