I've just released version 2.29 of #snac, the simple, minimalistic #ActivityPub instance server written in ANSI C, including the following:

New Mastodon API features: account search, relationships (so the Follow/Unfollow buttons now appear for each account), follow and unfollow accounts, an instance-level timeline (very kludgy), custom emojis for accounts and statuses, many bug fixes (sadly, the Mastodon official app still does not work).

https://comam.es/what-is-snac

If find #snac useful, consider buying grunfink a coffee: https://ko-fi.com/grunfink