Evver Games is an open source project that contains an AJAX web renderer and framework for creating card games; along with the card games Golf and No Peeking.
CGM aims to be a functional, easy-to-use web-based card game/management app. At this time there is OCTGN and a few other pay-to-use alternatives that are available, and OCTGN is the most familiar to me (for playing Game of Thrones and Magic). There is no functionality that OCTGN (or any card management app for that matter) has that couldn't be available from a web-based app.
As we are fascinated by the card game "Wizard" and inspired by the Sourceforge project "Cardwizard", we are now trying to make a php online version of it. Goal is to play either alone against two NPCs or in multiplayer with other human players.