The Action Network is online organizing tools, like those used by President Obama's team in 2008 and 2012 (it says so on their site). The goal is to facilitate grass roots activism by making it easy for activists to find each other, to sponsor or host events, and to just get things done.
The Progressive Independents G+ group. As you'd expect, a lot of people fed up with the DNC, but also just people wanting to organize and figure out how to keep Progressive goals on the political radar against the corporate lobbyists.
I'm a little less clear about the Working Families Party, but I have it on good authority that their main goal isn't so much to get their own candidates elected, as to help support and encourage Progressive candidates across the board. Specifically, they're organizing to pressure President Trump* to help all Americans, and generally do good deeds.**
The WFP say: "We need to stick together and defend our allies, friends, and neighbors against the Trump Presidency. It'll require hard work and a lot of organizing in our communities. If we want to build the seeds of a future that's safe and secure for everyone, we need to rise up together now."
(* Yeah, I threw up a little in my mouth just writing that.)
(** And by "do good deeds," I mean "don't be himself.")