NuPack is a free, open source developer focused package management system for the .NET platform intent on simplifying the process of incorporating third party libraries into a .NET application during development.
There are a large number of useful 3rd party open source libraries out there for the .NET platform, but for those not familiar with the OSS ecosystem, it can be a pain to pull these libraries into a project.
NuPack automates all these common and tedious tasks for a package as well as its dependencies. It removes nearly all of the challenges of incorporating a third party open source library into a project’s source tree. Of course, using that library properly is still up to the developer.
PTVS is a free/OSS plugin that turns Visual Studio into a Python IDE. PTVS supports CPython, IronPython, editing, browsing, Intellisense, mixed Python/C++ debugging, profiling, HPC clusters, multiple REPL's, IPython, Django, and cloud computing with client libraries for Windows, Linux and MacOS. This is an officially supported product from Microsoft's Developer Division.