[mmavnn]

Packages generally work fine, although if they rely on native binaries they often require a bit of tweaking to point at the Linux .so rather than the windows .dll. That's uncommon in the .net world though.

The ecosystem is huge; http://nuget.org hosts the main .net package collection, and it fairly comprehension. Also, to be fair to MS the standard library is pretty "batteries included"; it just doesn't always have what I would consider the nicest APIs.