Sage & Sand is a D6 system; with each level in a particular skill giving you a D6.
For example, if you have Medic level 2, you roll 2D6, and compare the result of each D6 against the Target Number (TN) of the task.
Very Easy is 2-6, Easy task is 3-6, Average is 4-6, Difficult is 5-6, Extremely Difficult is 6.
So an Average difficulty is 4-6 on a D6.
Artwork: pencil drawn.
The PDF is printer friendly.
The system has a magic/rituals section (some of it Cthulhu based); so you could have a fantasy setting.
You could change the 'spells' to psionics with some work.
The armour section has 4 types (leather, kevlar, plate, and scale); so mostly fantasy again. You could add some modern/future types.
Weapons: mostly fantasy types again (melee p17, ranged p23).
You could give the apocalypse theme a fantasy setting, as technology is very uncommon.
Although you could use the rules to make a fantasy setting, apart from the apocalypse setting described in the book.
The publisher website has no resources, forum etc, to expand the game. It'll be up to you and the players.
All in all, not a bad system.
Out of 49 pages, 47 are the game (including contents & index list).
At £5.28, it's not too bad.