List of free webhook stuff for developerππ½
If you're looking for all programming tools around webhook (not just free). Check this page List of webhook Programming Tools

Ctfreak
A centralized task scheduler. Say goodbye to cron and maintain, schedule and run all your shell scripts from one place.
Tag: cron, scheduling, automation, task, ssh, webhook
Single Sign-On Unlimited nodes Unlimited tasks Unlimited notifiers Unlimited executions Up to 3 users Sequential task executions