The Visual Studio Tools for Unity are able to convert .NET debug symbol files (namely pdb files) to debug symbols files that are understood by Unity's scripting engine (namely .dll.mdb files) when importing both the .dll and the .pdb in the Assets folder.
If you prefer to handle the conversion yourself you need to call a tool named pdb2mdb on the .dll associated with the .pdb:
pdb2mdb MyLibrary.dll
Will produce a MyLibrary.dll.mdb usable on Unity if MyLibrary.pdb is present.
This is a compilation of various open-source Unity plugins, codebases, or utility scripts that may aid in expediting the development process.
"ProbePolisher is a Unity Editor plugin for editing light probes. It works both on Unity Basic (free) and Unity Pro."
Kinesis Freestyle (Terrible key switches. Mushy and un-lovable)
Kinesis Freestyle Edge (Traditional layout with too many keys, mech switches, proably too big to be tented easily/properly)
Matias Ergo Pro (Looks pretty great. Have not tried.)
ErgoDox Kit (Currently, my everyday keyboard. Can buy pre-assembled on eBay.)
ErgoDox EZ (Prolly the best option for most people.)