MPRESS is a free, high-performance executable packer for 64-bit,32-bit, .NET (PE32/PE32+/.NET) executable formats! It uses in-place decompression technique, which allows to decompress the executable without memory overhead or other drawbacks; it also protects programs against reverse engineering by non-professional hacker. MPRESS does not use any library or contain any code which is under different license (i.e. GPL, LGPL, etc.).
.netshrink is an executable compressor for managed files. It uses LZMA compression library and can decrease your file size by 50%. It can also protect your files with a password.
.netshrink uses LZMA compression library to achieve maximum compression ratios. Password protection uses verification based on SHA256 hash function and 256 bit AES / Rijndael encryption.