MODx and MODx2 were indeed the original unofficial
mods at Etomite (modules, hah!).
When we were censored and all our content/resources removed from the Etomite site, we started releasing MODx Technology Previews, also known as TP1 and TP2.
In order to be "officially" recognized at OpenSourceCMS (and have a demo hosted), we lost the Technology Preview label, and released the first official (or stable) MODx release at 0.9.0. We’re days away from another 0.9.x series release with loads of new features and bug fixes. Then we’ll be shifting gears for a milestone 1.0 release effort. Just wait until we reveal the 1.0 roadmap following this release and I truly believe you won’t be disappointed, nor bothered by our quirky historical versioning schemes.