What are some alternatives?
When comparing ImageOptim and TotalTerminal, you can also consider the following products
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).
CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Hammerspoon - This is a tool for powerful automation of OS X.
DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.
pngquant - command-line utility and library for lossy compression of PNG images