HorsemansBrutaldon is good. Django server that run a completely stripped down, JS free mastodon UI.
Its target browser is Lynx! That's how you know it's good.
Jonkman Microblog is a social network, courtesy of SOBAC Microcomputer Services. It runs on GNU social, version 1.2.0-beta5, available under the GNU Affero General Public License.
All Jonkman Microblog content and data are available under the Creative Commons Attribution 3.0 license.