UPX - UPX (Ultimate Packer for eXecutables) achieves an excellent compression ratio and offers very fast...
Smallpdf - PDF document management and conversion suite
FileOptimizer - FileOptimizer is a lossless file size optimizer supporting AIR, APK, APNG APPX, BMP, CBZ, DOCX...
iLovePDF - Free online PDF tool set
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Kingshiper Image Compressor - With Kingshiper Image Compressor, you can easily compress, optimize and reduce jpg, jpeg, png, svg and gif file to a smaller size in seconds.