Mods/BlockLauncher

BlockLauncher is a free mobile app that allows you to use modifications in Minecraft: Pocket Edition. It has gone slightly obsolete since the addition of addons to MCPE.

Mods
Mods for BlockLauncher are commonly written in JavaScript as a  file. You can make mods in C++ too as an  file that modifies BlockLauncher.

Mods for Pocket Edition have gotten very popular, and there are now apps for downloading mods.

Importing Mods
To use mods you must first import it. To import the mod you must open the  file and tap import, then open BlockLauncher and enable the mod.

Mods/BlockLauncher