The "Sims 3 Package Interface" (S3PI) provides a Core Library of portable code that "understands" The Sims 3 game Packages files. Note that (with some minor tweaks) the Core Library code also understands other game Package formats (e.g. SimCity Online, The Sims 4).

A WIP Sims Mod Manager Sims 2-4

Basic Visual Studio template for you to get you straight into creating scripting mods for The Sims 3.

Software to easily reduce, compress and decompress Package-Files

I/O library for The Sims, based on SimPE.

Decompress all installation files of Sims 3 with this. This is not my code, it's by simmythesim. This is just a backup of a project that's no longer supported, but it may be useful to others.

Organize Mods/CC for Sims 3 and find conflicting resources. This is not my code, it's by g0kur. This is just a backup of a project that's no longer supported, but it may be useful to others.

MonoPatcher Windows command-line console plugin for The Sims 3

An GUI launcher for Sims 3 on alder lake CPUs

Decode and convert EA Layer 3 compressed audio, video files with WAV, FLAC and M4A support

MacOS Tattooinator for the Sims 3

sims 3 startup fixer

S2PK, or Sims 2 Package Manager, aims to provide a simple cross-platform solution to package management.

Manage and organize Sims custom content packages with a user-friendly tool built in Godot for easy sorting and game compatibility checks.