| Zipbit | | Works with popular archive types and has skin support. |
| ZipMail | | Compression for Lotus Notes, that automatically compresses attached files into ZIP files or self-extracting files. Features full integration with the Lotus Notes email client software. |
| Zipsearch | | Zipsearch is shareware to search compressed zip archives for files inside archives. The program finds text strings within the files for viewing and changes. |
| zlib | | A massively spiffy yet delicately unobtrusive compression library. |
| Zzip | | A compression tool under GPL. Zzip compression algorithm is mainly based on the Burrows-Wheeler Transform method developped by Mike Burrows and David Wheeler. |
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