Remember Jazz Jackrabbit? If you answered yes then you probably also remember a time when Shareware was a thing, and checking out games by inserting floppies into your PC was the original download. And now, both Jazz Jackrabbit, the sequel and another Epic gem, Epic Pinball are all available via GOG.com.
When console gamers had Mario and Sonic, PC players had Jazz. Which were designed by none other than Cliff 'Gears of War' Bleszinski. Ahh, memories. As an added bonus Jazz Jackrabbit 2 also comes pre-bundled with the JJ2+ mod for extra community made goodness.
Links: Jazz Jackrabbit
, Jazz Jackrabbit 2
, Epic Pinball
AusGamers is a GOG partner, so if you decide to get some Jazz you'll also be supporting the site.