A free mod for Mass Effect 3, by ME3Tweaks.

Legendary Explorer is an unofficial modding toolkit for mod creators of the Mass Effect. This includes the Mass Effect trilogy as well as the Mass Effect Legendary Edition. It is a development kit for developers or authors – not for users or installers.

Within this kit are nearly 30 various tools or utilities set to aid mod authors into crafting the necessary files that make up most mods. Some of its features include an asset database, a package editor, a sequence editor, a dialogue editor, convenience tools to simplify the modding process, and many more.