1)   IvanView 2008
View, Browse, Edit and Convert Digital Images. It's capable of viewing more 60 image formats and has unsurpassed conversion capabilities in 15 of the most popular formats. You simply must see it!

 2)   Advanced Batch Converter 3.9.77
Stop wasting time renaming, resizing or converting images one by one. Quit getting frustrated over complicated image processing software like Photoshop that make performing the most basic image editing tasks a headache. Get Advanced Batch Converter!

 3)   Smart Converter CL 1.9.24
Smart Converter CL is a heavy-duty command line batch image converter that supports 88 image formats and works with Formula 1 speed. Conversion and batch processing (resizing, cropping, etc.) are done through command line only (no GUI)!