0install 

Zero Install management of implementation caches, digital signatures, etc.

Zero Install services for solving dependencies, downloading implementations, executing apps, etc.

Microsoft.Deployment.*.dll libraries extracted from WiX Toolset. Useful for extracting .cab and .msi files.

Utilities for creating and modifying Zero Install feed files

Zero Install interfaces/abstractions for types from ZeroInstall.Services package

Zero Install methods for integrating applications with desktop environments (creating menu entries, etc.).

Zero Install data model for the feed format

Command-line interface for Zero Install (both an actual CLI and a library for building other clients)