Arduboy Uploader is one of the simplest ways to load new games on your Arduboy. Combined with one of the most complete repositories of Arduboy games it's a great tool if you're not familiar with Arduino.
Arduboy Manager is a great way to load games onto your PC. Compatible with repositories, .arduboy files and has great features like screen capturing this is an excellent tool to quickly swap out games from your Arduboy!
Arduboy Utility is an Android application that can flash software to your Arduboy over OTG cable. Additionally it can flash and backup EEPROM data as well as a serial monitor that is compatible with display mirroring.
Arduboy Game Loader was the first software tool available to upload games to your Arduboy. It's designed for use with .arduboy files and is the best way to load games created by TEAM a.r.g. onto your Arduboy.
Arduino remains to be the primary way to develop code for the Arduboy. It is also an excellent way to try compiling others open source games. Additionally it is currently the only way for Mac and Linux users to load games to their Arduboy.