1)   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)!

 2)   Smart Converter 1.9.22
A multipurpose program for viewing, converting, and editing images, with a rich tool set, and various effects and filters. Batch mode offers several operations at one pass, such as resizing, converting format, renaming, and adding captions.

 3)   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!