It's a mix of many different mods. Have fun as you try to get to the Aether, along with fighting Infernal Mobs and many other bosses. Remember that there will be many different updates that should be coming soon.
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name (Insanium) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Insanium from the list on the left. The launcher will handle everything else!