It's not exactly an open tuning. Open tunings generally are a chord when strummed (so standard tuning is actually an "open" tuning, Open C6). You need at least three notes for a chord. So if you left the E alone (or maybe tuned the G up to A... probably other ways too) it'd be an open C chord.
Your tuning reminds me a little bit of the banjo "sawmill" tuning. Probably can do some interesting clawhammer stuff on it.