I've been using several sets not mentioned:
- Chain Reaction [free]
- 5 Kilometers from Leipzig [free]
- One-Hour Skirmish Wargames
- Neil Thomas "Wargaming an Introduction" has a simple skirmish game
- Battlespace
- "In Country: Recon" is excellent and [free], here:
https://esspod.shop/products/inx-rulebooksIt is a contemporary combat game.