- Sentry (django) - https://github.com/getsentry/sentry
- Managed - https://sentry.io/welcome/
- Taiga (django, python, angular) - https://github.com/taigaio
- Managed - https://taiga.io/
- Redmine (rails, ruby) - https://github.com/redmine/redmine
- Nagios (c/c++) https://github.com/NagiosEnterprises/nagioscore
- Zabbix (php) https://git.zabbix.com/projects/zbx/repos/zabbix/browse
- Icinga (c/c++) https://github.com/Icinga/icinga2
- Netdata (c/c++) https://github.com/netdata/netdata
- Shinken (python) https://github.com/naparuba/shinken
- CheckML (c/c++/python) https://github.com/tribe29/checkMK/
- Outline (node.js, react) https://github.com/outline/outline
- Papercups (Elixir) https://github.com/papercups-io/papercups
- Managed Version - https://papercups.io/
- Chatwood (ruby) https://github.com/chatwoot/chatwoot
- Managed Version - https://www.chatwoot.com/
- Baserow (python) (https://gitlab.com/bramw/baserow)
- Managed Version - https://baserow.io/