What do you define as "special"? Wet stones are one of the oldest as far as sharpening blades and has been one of the more effective methods for it. There hundreds of companies that make them at varying qualities, grits, and sizes. If you're looking for techniques; there are a lot on YouTube and several webpages with people showing how to sharpen a blade with various tools.
Wet Stone:
https://youtu.be/rTKV5-ZSWcESharpening Steel:
https://youtu.be/Teh0Cw84QGQA coffee cup(don't ask me why):
https://youtu.be/fgWeJ9H556I5 ways without a stone(might work, IDK):
https://youtu.be/VKwpDJN5i20And just for the sake of it, here's Gordon Ramsey doing it!:
https://youtu.be/SBn1i9YqN1kEnjoy.