Smallpdf - PDF document management and conversion suite
UPX - UPX (Ultimate Packer for eXecutables) achieves an excellent compression ratio and offers very fast...
iLovePDF - Free online PDF tool set
FileOptimizer - FileOptimizer is a lossless file size optimizer supporting AIR, APK, APNG APPX, BMP, CBZ, DOCX...
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.