Services: pretix

services.md

@@ -226,6 +226,7 @@ Finance:
 
 * [Timestrap: time tracking and invoicing](https://github.com/overshard/timestrap).
 * [ihatemoney - Account manager](https://ihatemoney.org/) ([code](https://github.com/spiral-project/ihatemoney)).
+* [pretix](https://pretix.eu/about/en/): ticketing software that cares about your event—all the way.
 
 Conferences
 -----------