These are policy-driven snapshot management and replication tools which use OpenZFS for underlying next-gen storage. (Btrfs support plans are shelved unless and until btrfs becomes reliable.)

The book documenting the curl project, the curl tool, libcurl and more. Simply put: everything curl.

Tool for creating snapshots and remote backups of btrfs subvolumes

Spotify Tools - Playlists Backups, Spotify CLI, URI translator, duplication detection / removal, API search queries, API automation etc.