Batch Image Commander 

Batch Image Commander is a batch image processor made for command line operation and as a System Tray Icon application for timer based operation.
command line jpeg resize timer-based batch processing image processes prefix suffix thumbnails

Neomesh Image Console 

Neomesh Image Console is a command line image converter allowing you to convert image formats, create GIF animations, join and manipulate your images. Image Console is able to load 22 and save 17 image formats.
console image command line image command line jpg command line image resizer command line bmp command line thumbnail command line gif command line tif command line image converter commandline image console animation

AutoBatch It! 

AutoBatch It! v2 is a batch image processor made for command line operation and as a System Tray Icon application for timer based operation.
command line jpeg resize timer-based batch processing image processes prefix suffix thumbnails