Yes, it is possible to mod open-source video games. Since the source code is available, you can modify the game's code, assets, or mechanics to create new content, features, or improvements. The open-source nature of these games encourages community involvement and collaboration, allowing for the development of mods, expansions, and even entirely new games based on the original code.

For example, Battle for Wesnoth has a large community that creates custom campaigns, units, and maps. Similarly, OpenRA has mods that bring new factions, units, and gameplay mechanics to the game.

To mod an open-source game, you'll need some programming knowledge and familiarity with the game's codebase, as well as any required tools or software for editing assets like graphics, sounds, or maps. The specific process for modding each game may vary, so it's essential to consult the game's documentation or community resources for guidance.
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