Strypey@ViletteAlex @Gargron as well as #PixelFed there is also #Anfora. The oldest attempt to create something like this was Quit.im - a web client for #GNUsocial - but I don't know if it's still being actively developed.
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.