nookZax is an Android implementation of the Zax Z-Machine interpreter optimized for the nook hardware. nookZax can be used to play Z-Machine compatible interactive fiction games, e.g., the stories created by Infocom (Zork, Enchanter, etc
PPSSPP is the best, original and only PSP emulator for Android. It runs a lot of games, but depending on the power of your device all may not run at full speed. Buy PPSSPP Gold to support the development. Please note that ARMv6-based devices may have various kinds of issues, and more modern devices are recommended