International Development (formerly Teshcha Games, International Engagement) is a group of mod developers for Half-Life 1 using the Xash3D engine, working since 2025.
The group specializes in creating models and textures using the GoldSRC/Xash3D engine and full-fledged modifications using the Xash3D engine.
The group's first work was the "Zhimolost" mod, released on August 10, 2025.