When comparing Endless Sky vs Freedoom, the Slant community recommends Endless Sky for most people. In the question“What are the best open-source games?” Endless Sky is ranked 18th while Freedoom is ranked 38th. The most important reason people chose Endless Sky is:
This game is free to play and distribute. It also has a large developer base that works to solve all issues. This also provides endless possibilities to expand the universe by adding new missions, alien species, planets, etc.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Open source
This game is free to play and distribute. It also has a large developer base that works to solve all issues. This also provides endless possibilities to expand the universe by adding new missions, alien species, planets, etc.
Pro Cross-platform
This games runs on Windows, Mac, and Linux.
Pro Low system requirments
This game only requires 350 MB of RAM and 65 MB for storage.
Pro The Doom feeling without the proprietary data files
Pro Thousands of available mods
Pro Easy mod creation
Making new levels and even gameplay mods is fairly easy and requires no programming knowledge.
Pro Easily moddable
You can apply mods others have made in a straightforward fashion. Find a mod you like (either from a quick google search or checking moddb for some) and the individual mod pages have a "tutorials" tab that you can use to figure out how to install it. It differs from mod to mod, but in most cases, it's fairly simple.
Pro Well documented modding possiblities
There are numerous tutorials providing detailed help with the modding and wikis providing extensive information on all aspects of the game