The Haiku source is continually built by a dedicated machine. These "nightly images" are provided mainly for development and testing purposes. You can download and install these snapshots to check out the latest features and bugfixes, be aware though that they may be unstable at times.
For more information on missing packages, image and archive formats, etc., please refer to this site's main page.
Supported 32-bit Nightly Images (x86 GCC 2 Hybrid)