triptico.com is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
[$] The campaign to push Northstar into Linux distributions
There is not a broad selection of mature, open-source web-browser engines for Linux users. Most of the browsers available for Linux are based on one of just three projects: Chromiu [...]