UZDoom

Steamless is a DRM remover of the SteamStub variants. The goal of Steamless is to make a single solution for unpacking all Steam DRM-packed files. Steamless aims to support as many games as possible.

A powerful unpacker and forensic app for Inno Setup-based installers. It allows you to open, examine, inspect, extract and more the files and internal content of installers.

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SLADE3 is a modern editor for Doom-engine based games and source ports. It has the ability to view, modify, and write many different game-specific formats, and even convert between some of them, or from/to other generic formats such as PNG.