From the site:

eXoDOS is an attempt to catalog, obtain, and make playable every game developed for the DOS and PC Booter platform. We strive to find original media rather than using scene rips or hacks. This collection uses DOSBox to allow these older games to play on modern systems. Games supported by ScummVM give the user a choice between emulators. All required emulators are included and have been setup to run all included titles with no prior knowledge or experience required on the users part.

This pack includes 7,200 DOS games. The focus is on games that were either released in English or are fairly easy to play without a knowledge of the native language. This is not every DOS game ever made, however it is a very high percentage of all commercial releases. There are thousands of freeware, homebrew, and shareware games that will continue to be added in future packs.