9 of the games are also on Steam, the rest are DRM free and for download:
$1 tier:
METAL SLUG 2 (Steam)
FATAL FURY SPECIAL
KING OF THE MONSTERS
ART OF FIGHTING 2
SAMURAI SHODOWN II
SENGOKU 3
KING OF FIGHTERS 2000
BLAZING STAR
IRONCLAD
BASEBALL STARS 2 (Steam)
BTA tier:
METAL SLUG 3 (Steam)
METAL SLUG (Steam)
KING OF FIGHTERS '98 UMF EDITION (Steam)
TWINKLE STAR SPRITES (Steam)
SHOCK TROOPERS (Steam)
KING OF FIGHTERS 2002
LAST BLADE
PULSTAR
NEO TURF MASTERS
REAL BOUT FATAL FURY 2: THE NEWCOMERS
Neo Geo 25th Anniversary Soundtrack
$10 tier:
SHOCK TROOPERS: 2nd SQUAD
KING OF FIGHTERS 2002 UNLIMITED MATCH (Steam)
METAL SLUG X (Steam)
GAROU: MARK OF THE WOLVES
SAMURAI SHODOWN V SPECIAL
Enjoy.
When they say download, is that an actual client to run the game offline? Or is it play in a web browser? (the later I believe is what they did with the first neo geo bundle)