PowerOS Calcite

Calcite was a codename for a cancelled project for PowerOS Millenal, sceduled to release in 2004, alongside Beryl. Unlike Beryl, it had 1 build, build 2563. Unlike most PowerOS Versions, it had a oldschool, BeOS-Like GUI. This Build, luckily, has no timebomb, wich means it is usable. It is the 2nd most used pre release software, just behind Peridot. Calcite is widely used in Low-End Computers and Schools. The teachers and students love it!
Due to the extreme support of Calcite, it holds 1% of the Entire PowerOS Marketshare! Pepole are making custom builds thanks to PowerOS and PowerOS Millenal being Open-Source. Some Pepole made up-to-date versions of Calcite, like PowerOS 04(2011), LeiriaOS(2016), etc. 
Trivia
Like i said, Calcite has a BeOS GUI, wich means it is easy to replicate. Haiku and Calcite are ALMOST identical.
But thankfully, Calcite has a different Boot Screen.
Unlike Beryl, it is very stable. It can run on computers with only 64MB RAM and 512 MB Storage without any issues! 
Sounds
Calcite used Millenal 2002 sounds, as seen on Turquoise.
Conclusion
Calcite did very well, and it holds 1% of PowerOS MarketShare, and Peridot holds 1.5%!