GRUB - Multiboot boot loader
Altstore - A home for apps that push the boundaries on iOS
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.
Cydia - An alternative app store for jailbroken devices.
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
iOS Haven - A listing of tweaked apps and games for iOS devices. Install directly from the browser.