What are some alternatives?
When comparing ImageOptim and CodeKit, you can also consider the following products
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).
TotalTerminal - TotalTerminal is a plugin for Terminal. app which provides Quake-style terminal window available on keyboard shortcut.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Django - The Web framework for perfectionists with deadlines
Hammerspoon - This is a tool for powerful automation of OS X.