Looking here, Indivisible seems to be more of a loose coalition of individual local groups than a centralized top-down organization. Having looked at some of the groups on there that are in my area, it seems to be pretty broad, including mainline Dem committees, "progressives", woman's clubs, antifa, etc. Based on what I've read, their plan seems to be to try to take power at the local level, which is obviously pretty dangerous if they can actually get organized. Most organization is done through Zuckbook. Have a look at your local chapter.
I think its funded by a Soros connection. While I don't doubt it, I haven't actually dug into it myself. It's probably worthwhile to look into (((who))) is actually behind this and see if there's any connections to the usual suspects.
Their guide:
indivisibleguide.com
Keep this bumped, more info incoming.