Easy Compression Library is a very easy-to-use replacement of TFileStream, TMemoryStream and other TStream descendants to their analogues with compression/decompression and encryption. Compression is transparent, all the methods, properties and behavior of TFileStream and TMemoryStream are supported, so it is very simple to replace them in the application code.
Easy Compression Library does not support multi-file archives. If you need to compress multiple files to a single archive file try FlexCompress or ZipForge.
Current version: 5.40
Released: May 15, 2014
Price: $ 199
I don't think I've ever had a better support experience in regard to any of the 3rd party tools we use.