Cool things on Firefish/clackey, that Mastodon and most of it forks don't have:
• Quote notes (Misskey and Akkoma, a fork of Pleroma, also have them)
• Antennas. They allow you to add words, tags and accounts to lists and create parallel timelines that you can see whenever you want, without having to follow this accounts
• You can create personalized timelines for certain accounts to appear in.
• It has a drive section where you can upload files.
• Channels. This are public local group that the members of a server can create, join and interact within.
• Private chat groups. Local only.
• Emoji reactions
• Clips. These are collections of notes ("note" is the name post receive in Misskey and Firefish)
You can create multiple clips and manage them by giving a name and description to each. You can also choose to make your clips public to make them available to other users.
• You can create custom web pages. For now they don't federate.