ATLauncher

ATLauncher is a launcher, community and large group of modpacks founded by RyanTheAllmighty. When wanted to share his personal modpack with his YouTube audience, he created the ATLauncher in order to do so. Unlike most platforms, ATLauncher does not have any official modpacks. All of the modpacks available through it are third-party modpacks. There are about 100 public modpacks available, with about 300 modpacks total. A large amount of ATLauncher's modpacks are for private servers, and several are created by YouTubers and streamers. Many are for general use, however. The most popular of these include SkyFactory 2 and Resonant Rise, which have millions of downloads.

The Launcher
The ATLauncher has gone through several stages. The current version includes a page with news, a page with all of the installable modpacks, a page with all of the user's instances, a page for managing accounts, a tools page, and a settings page.