[suprjami]

OpenXcom adds a whole heap of wonderful conveniences to UFO/X-Com. It's probably my favourite open source game engine clone thing.

https://openxcom.org/

[snvzz]

Dolls / Girls Frontline 2: Exilium[0][1][2] is a modern take on the XCOM concept.

Free (but gacha.)

0. https://gf2exilium.sunborngame.com/main

1. https://gf2.haoplay.com/jp/

2. https://store.steampowered.com/app/3308670/GIRLS_FRONTLINE_2...

[suprjami]

> gacha

Hard pass.

[lionkor]

> my favourite open source game engine clone thing

For me that's OpenMW

https://openmw.org/