Crontab UI - Easy and safe way to manage your crontab file
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
Scheduled tasks - GNOME GUI for configuring a users' cron (automatic jobs). Some of its features are:
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
024h Lucky Reminder - 024h Lucky Reminder is a reminder software for home and office.
HTTP Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.