diff --git a/README.md b/README.md
index 9cbc32b..1a38e0e 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ Proxmox VE Server with at least one configured ZFS Pool.
 - `mailpiler` => mailpiler mail archive [mailpiler.org](https://www.mailpiler.org/)
 - `matrix` => Matrix Synapse Homeserver [matrix.org](https://matrix.org/docs/projects/server/synapse) with Element Web [Element on github](https://github.com/vector-im/element-web)
 - `nextcloud` => Nextcloud Server [nextcloud.com](https://nextcloud.com/) with fail2ban und redis configuration
+- `checkmk` => CheckMK 2.0 Raw Edition [checkmk.com](https://checkmk.com) with our Fork of Matrix Notification Plugin (https://github.com/bashclub/check_mk_matrix_notifications)
+- `open3a` => Open3A accounting software for small and medium business [open3a.de](https://www.open3a.de/)
 - `debian-unpriv` => Debian unprivileged container with basic toolset
 - `debian-priv` => Debian privileged container with basic toolset
 ## Usage