Ombi

You can use Sonarr, Radarr to add series and movies more or less manually to your media archive. You can use Ombi as a single point of entry instead.

Ombi (from github page)
GitHub - Ombi-app/Ombi: Want a Movie or TV Show on Plex/Emby/Jellyfin? Use Ombi!
Want a Movie or TV Show on Plex/Emby/Jellyfin? Use Ombi! - GitHub - Ombi-app/Ombi: Want a Movie or TV Show on Plex/Emby/Jellyfin? Use Ombi!

Shields.io

This is an interesting badge generation tool, you can use in your e.g. readme files in your repositories.

I think I'll install it and integrate it with drone when I'll get around to install drone :)

Shields.io: Quality metadata badges for open source projects
We serve fast and scalable informational images as badgesfor GitHub, Travis CI, Jenkins, WordPress and many more services. Use them totrack the state of your projects, or for promotional purposes.

Joplin

Jopin is a note taking app and it looks like this:

It's simple, clear and has a good core functionality.

Joplin website
Joplin, the open source note-taking application

Zabbix

I really wanted to install zabbix to monitor my infrastructure. Hopefully, I'll get to it sooner rather than later, because in conjunction with a notification app this would be essential!

Zabbix :: The Enterprise-Class Open Source Network Monitoring Solution
Zabbix is a mature and effortless enterprise-class open source monitoring solution for network monitoring and application monitoring of millions of metrics.

It has an ansible role already:

GitHub - ansible-collections/community.zabbix: Zabbix Ansible modules
Zabbix Ansible modules. Contribute to ansible-collections/community.zabbix development by creating an account on GitHub.

Zulip

Zulip combines the immediacy of real-time chat with an email threading model.
With Zulip, you can catch up on important conversations while ignoring irrelevant ones.

While I don't have a real use for it (it looks more enterprise-y to me), The list of features and the self-hosted aspect are really appealing.

Zulip: Open-source team chat with topic-based threading
Zulip is the only modern team chat app that is designed for both live and asynchronous conversations. Organized to help you collaborate productively and efficiently.

HTH,