Gyazo for Mac was first developed by Toshiyuki Masui

Gyazowin was developed by tnj

• Support for uploading all file types. The file should be passed as an argument for the app (drag-n-drop, "Open with..." or "Send To...")
• Support for private uploaders - you can set an authentification token for client and server

These features should be supported by server. I've developed NodeJS server, so you can use it.