Year of the Dragon is a mod for the original Half-Life currently being created by modder Magic Nipples. When complete, it will let you play Valve's classic shooter not as a nerdy physicist who is somehow able to demolish SWAT teams, but as lovable purple dragon Spyro.
Year of the Dragon has been in the works since November of last year and has made plenty of progress. In the video below you can see how a third-person camera works with Half-Life, as well as check out the gliding mechanics in action. The gib test for Spyro's death animation is a bit off-putting, to be honest.