Alternative to MOSS?

Is MindQuarry an alternative to MOSS 2007 or WSS 3.0?

http://www.opensourcetutor.com/2007/06/07/open-source-sharepoint-alternatives-remote-collaboration/

http://www.mindquarry.com/

I’m seriously thinking of switching to open source offerings, hosted by places such as www.RailsPlayground.com and offering big bundles new powerful technologies (as www.edgewall.com/trac and http://subversion.tigris.org (beyond Sharepoint individual file/item versioning: full mySQL-based source code configuration management (even better than Microsoft’s own Visual Source Safe I’m hearing) with WebDAV access)), among many other technologies as www.RubyOnRails.Org for database-driven sites and www.Xoops.Org portals, plus dozens of others just clicks away (see http://netenberg.com/fantastico_scripts.php ). ) –competition which a Sharepoint host might want to keep an eye on (if you don’t already know).