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
An on-premise task scheduler. Say goodbye to cron and maintain, schedule and run all your tasks from one place.
Tag: cron, scheduling, automation, task, ssh, shell script, webhook, chart report, sql
Single Sign-On Unlimited nodes Unlimited databases Unlimited webhooks Unlimited notifiers Unlimited executions Up to 3 users Up to 15 tasks (incl. 2 SQL reports) Sequential task executions