Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.

Ajenti Core and stock plugins

Insular email distribution - mail server as Docker images

Ticket shop application for conferences, festivals, concerts, tech events, shows, exhibitions, workshops, barcamps, etc.

Embed a highly customizable web calendar into your website using ICal source links

Format your exported WhatsApp conversation in HTML

Internal tool to automatically create screenshots of pretix features for documentation purposes

ISPMail Installation Program