diff --git a/README.md b/README.md
index 98fb403..803a46a 100644
--- a/README.md
+++ b/README.md
@@ -6,12 +6,17 @@
 | ----------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------- | -------------- | ---------------- | ----------------------------- |
 | [Agorakit](https://agorakit.org/)                     | [GitHub](https://github.com/philippejadin/agorakit)                                                                           | mature         | PHP              | GPLv3                         |
 | [attendize](https://www.attendize.com/)               | [GitHub](https://github.com/Attendize/Attendize)                                                                              | mature         | PHP              | Attribution Assurance License |
+| Calendar.social                                       | [gitea](https://gitea.polonkai.eu/gergely/calendar-social)                                                                    | defunct        | Python           | AGPLv3                        |
 | Chapter by freeCodeCamp                               | [GitHub](https://github.com/freeCodeCamp/chapter)                                                                             | new            | JavaScript       | BSD 3-Clause                  |
+| [Communecter](https://www.communecter.org/)           | [GitHub](https://github.com/pixelhumain/communecter)                                                                          | defunct        | PHP              | Apache 2.0                    |
 | [eventoL](http://eventol.github.io/eventoL/)          | [GitHub](https://github.com/eventoL/eventoL)                                                                                  | mature         | Python           | GPLv3                         |
+| [Friendica](https://friendi.ca/)                      | [GitHub](https://github.com/friendica/friendica)                                                                              | mature         | PHP              | AGPLv3                        |
 | [Gancio](https://gancio.org/)                         | [Framagit](https://framagit.org/les/gancio)                                                                                   | new            | JavaScript       | AGPLv3                        |
 | [Gath](https://gath.io/)                              | [GitHub](https://github.com/lowercasename/gathio)                                                                             | new            | JavaScript       | GPLv3                         |
 | [GetTogether](https://gettogether.community/)         | [GitHub](https://github.com/GetTogetherComm/GetTogether)                                                                      | mature         | Python           | BSD 2-Clause                  |
 | [Gospeak](https://www.gospeak.fr/)                    | [GitHub](https://github.com/loicknuchel/gospeak)                                                                              | mature         | Scala            | Apache 2.0                    |
+| [Hubzilla](https://zotlabs.org/page/hubzilla/hubzilla-project) | [Framagit](https://framagit.org/hubzilla/core)                                                                       | mature         | PHP              | MIT                           |
+| [Human Connection](https://human-connection.social/)  | [GitHub](https://github.com/Human-Connection/Human-Connection)                                                                | mature         | JavaScript       | MIT                           |
 | [joind.in](https://joind.in/)                         | [GitHub](https://github.com/joindin/joindin-web2)                                                                             | mature         | PHP              | BSD 3-Clause                  |
 | [Meetdown](https://meetdown.org/)                     | [GitHub](https://github.com/structr/meetdown)                                                                                 | unmaintained   | Structr          | Apache 2.0                    |
 | Meetup Alternative by Thinkmill                       | [GitHub](https://github.com/Thinkmill/meetup-alternative)                                                                     | defunct        | JavaScript       | unlicensed                    |
@@ -22,6 +27,7 @@
 | [OpenKi](https://openki.net/)                         | [Gitlab](https://gitlab.com/Openki/Openki/)                                                                                   | mature         | MeteorJS         | AGPLv3                        |
 | [OSEM](https://osem.io/)                              | [GitHub](https://github.com/openSUSE/osem)                                                                                    | mature         | Ruby             | MIT                           |
 | [Pretix](https://pretix.eu/)                          | [Gitlab](https://github.com/pretix/pretix)                                                                                    | mature         | Python           | Apache 2.0                    |
+| [Upcoming](https://upcoming.org/)                     | [GitHub](https://github.com/upcoming/upcoming-www)                                                                            | mature         | JavaScript       | Apache 2.0                    |
 
 ¹: _mature_ = the project is actively used by groups, _new_ = this is a new project with no usable software, _in development_ = usable software exists, but is not ready for general use, _defunct_ = was under development, but more than 1 year without commits