Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
incron - This program is an "inotify cron" system. It consists of a daemon and a table manipulator.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
fcron - Fcron is a scheduler designed for Unix/Linux systems, especially usefull when your system is not up all the day long.
HTTP Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.
mcron - mcron is GNU's implementation of cron. It is a 100% compatible replacement for Vixie cron.