Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
RoxyApps Vector Conversion Tool - Converts svg, ai, cdr, ps, vsd, wmf and other vector files to png, pdf, ps, wmf, eps and back
FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
RoxyApps PPT Conversion Tool - Convert PPT file to html, pdf, jpg, png, eps and etc. Also you can convert various formats(key, dps, odp and etc.) to power point
ImageMagick - ImageMagick is a software suite to create, edit, and compose bitmap images.
Vector Conversion Tool - Easily convert your Vector files to other formats and back