Ctfreak is now available in the app store. (Been available for a while, but somehow missed making an announcement...)
Ctfreak allows you to centralize and schedule various types of tasks: Shell scripts (bash/powershell) on multiple servers concurrently via SSH, SQL scripts on multiple databases concurrently (mysql/mariadb/postgresql), HTTP request calls etc
Forum section: https://forum.cloudron.io/category/164/ctfreak
Thanks to @jypelle for packaging this!