leveldb-sharp is a portable C# binding for the C API of the LevelDB library.
To support the most reach leveldb-sharp is available under the 3-clause BSD license, which is the same license LevelDB uses.
leveldb-sharp uses the C API instead of the C++ API for portability. Using C++/CLI would have been the direct route but it is currently not portable outside of Windows. As I use the binding for Smuxi which targets Linux, Windows and OS X, the C API was the better pick.
leveldb-sharp offers:
Currently leveldb-sharp lacks: