Created out of my own self-interest but also as a lighter, faster, and more feature-restricted alternative to DotNetZip. Made with Apple's IPA archives in mind.

• Read existing zip archives
• Create new zip archives
• Update new or existing entries within a zip archive
• Per-entry compression
• Parallel compression
• Support for Windows and Unix platforms, including their respective file attributes and permissions
• Uses Microsoft's System.IO.Compression deflator

• Encryption
• LocalFileHeader / CentralDirectory extra fields, which usually houses high-precision timestamp data.
• Zip64

Force-net for Crc32.NET