diff --git a/README.md b/README.md
index 7d33c99..2fb5649 100644
--- a/README.md
+++ b/README.md
@@ -11,13 +11,14 @@
 | [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                    |
 | [joind.in](https://joind.in/)                         | [GitHub](https://github.com/joindin/joindin-web2)                                                                             | mature         | PHP              | BSD 3-Clause                  |
+| [Keystone Meetup Alternative](https://github.com/Thinkmill/meetup-alternative)| [GitHub](https://github.com/Thinkmill/meetup-alternative)                                                                             | open source         | JavaScript              | Apache 2.0                  |
 | [Mobilizon](https://joinmobilizon.org/en/)            | [framagit.org](https://framagit.org/framasoft/mobilizon/)                                                                     | in development | Elixir           | AGPL                          |
 | [on_ruby](https://www.onruby.eu/)                     | [GitHub](https://github.com/phoet/on_ruby)                                                                                    | mature         | Ruby             | (extended) Beer-ware          |
 | Open Event                                            | GitHub: [Frontend](https://github.com/fossasia/open-event-frontend), [Backend](https://github.com/fossasia/open-event-server) | mature         | Python           | Apache 2.0 & GPLv3            |
 | [Open Tech Calendar](https://opentechcalendar.co.uk/) | [GitLab](https://gitlab.com/opentechcalendar)                                                                                 | mature         | PHP              | BSD 3-Clause                  |
 | [OpenKi](https://openki.net/)                         | [Gitlab](https://gitlab.com/Openki/Openki/)                                                                                   | mature         | MeteorJS         | AGPLv3                        |
 
-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
+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, _open source_ = self hosted software used to build your own platform
 
 ## See also