Meridian
Meridian is a music player which allows you to listen to music from popular russian social network vk.com. It communicates with some additional services like echonest.com and last.fm to bring to you some advanced features: recommendations by genres, moods and your tastes, artists and albums search, artist radio and other. Meridian written in C# and WPF 4.5. This is the old WPF desktop version. The source code for new UWP version for Windows 10 can be found here.
Source code
Here is a source code of Meridian starting 4 version. Unfortunately most parts of code isn't documented yet.
Contributing
Changes and improvements are very welcome. Feel free to fork and open a pull request.
License
The source code is licensed under the Apache License.