Yes. There os also a commercial initiative by the author of VCV to have it as a VST im the DAW. The difference between the two are that Cardinal only accepts open source modules and is packaged with all of them, while the VCV official VST lets you download modules on the fly.
The fact that it's paid might be a turn off for some, but I've found it to be really useful, and it works really well inside of Ableton. Can't speak for other DAWs but having been using it for the past 6 months or so, it's been fantastic.
Does anyone know of good resources for folks who want to develop their own modules for VCV rack?
This is cool, but I think we are talking about different things. From reading the description of this project it looks like you can't actually _edit_ the individual modules. They still require compilation since it's C++. You can change the patch by adding modules and tweaking them a-la hardware Eurorack.
M4L and PD allow you to open the patch ("patch" as in MaxMSP patch, not a Eurorack patch) and edit its source code. Which is a completely different level of sound manipulation and synthesis.