TF2 Modders Rejoice: Valve Unveils Open-Source Code

Valve's Source SDK receives a massive update, granting full access to Team Fortress 2's codebase. This unprecedented move allows modders to create entirely new games based on TF2, going far beyond the limitations of Steam Workshop or standard modding.

This open-source access empowers creators to modify, expand, and even completely rewrite Team Fortress 2. However, Valve emphasizes a non-commercial clause: any resulting mods or derivative works must be freely distributed and cannot be sold. Despite this restriction, creations can be published on the Steam Store, appearing as independent games within the Steam game library.

Valve's decision acknowledges the significant contributions of the TF2 community, particularly regarding in-game items largely created through Steam Workshop contributions. To maintain this balance, Valve requests that modders refrain from creating content designed to profit from these community assets. Ideally, mods would continue to allow players access to their existing TF2 inventories.

This update extends beyond TF2, encompassing Valve's entire back catalog of multiplayer Source engine titles. These games will receive a substantial upgrade including 64-bit binary support, improved scalability for HUD/UI elements, prediction fixes, and numerous other enhancements. This affects DoD:S, HL2:DM, CS:S, and HLDM:S alongside TF2.

The announcement follows the December release of the seventh and final update to the Team Fortress 2 comic series, a seven-year project showcasing Valve's ongoing commitment to the franchise and its dedicated fanbase.