What are some alternatives?
When comparing MASGAU and Steam Mover, you can also consider the following products
GameSave Manager - Ever had to format your system?
Game Backup Monitor - Automatically backup your saved games with optional cloud support.
Open Game Panel - OGP is a game server control panel.
Steam Library Manager - Steam Library Manager is a tool created to manage your Steam and Origin Libraries in ease of use.
SaveGame Backup Manager - The target of the project is backing-up full savegame settings including registry keys.
Bright Game Panel - Bright Game Panel is a free and open source game server control panel.