Oxygen Font 0.1 is now released for testing purposes. The font still needs some tweaking; mainly to metrics, kerning pairs, and diacritic characters, but it should now be fit to fully test as a KDE system font for most European latin languages. The Cyrillic is still not useable, although it’s better than it was.
Oxygen Font 0.1 can be downloaded from Oxygen Font’s KDE repository. Please note this is not yet a finished font and is released only for testing purposes. Feel free to use and feed back.