Gnosis is a highly configurable castbar addon, but featuring much more than simple castbars. Gnosis can show ticks of channeled spells, detect unintentional clipping while channeling and combine data of channeled spells to combat text addons (MSBT, SCT, Parrot).
Modular approach to a casting bar addon. An overview of (hopefully most of) the modules: player, target, focus, buffs, flight, global cooldown, interrupt, latency, mirror, range, swing, timer, tradeskill merge.
The core of Quartz is lightweight implementation of a standard casting bar, with configurable size, text and icon positioning, and colors.