burg is a brand-new boot loader based on GRUB. It uses a new object format which allows it to be built in a wider range of OS, including Linux/Windows/OSX/FreeBSD, etc. It also supports graphical menu.
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A big con is that it can show graphical menu to select your OS and there are numerous built-in themes to choose from. Also you can easily install others.
Pro Based on GRUB
Since it's based on GRUB, it can handle everything GRUB can, which means it's pretty full-featured.
Con No more updates
The project seems dead and haven't had any updated since 2013.