ModTheSims, also referred to as MTS, is one of the largest Sims websites in existence. It hosts a wide variety of mods, custom content, and modding info for The Sims 2 and The Sims 3. It is maintained by Delphy.

ModTheSims is open to everyone, and is one of the easiest ways for new mod creators to host their own content without having to open their own website.
Because it has a huge userbase, it is also one of the best places to look for mods which cannot be found on other websites.

- _JT _JT notes:
  • Note that there is a strict PG-13 policy in place. For mods of a more "colorful" nature, you will have to look elsewhere. For instance, Woohooer might be allowed there, but Kama Simtra definitely would not.

For more information see the website itself.