This is not a HUD in its usual meaning, but some fixes for standard Team fortress 2 UI, adding HP numbers on target IDs, small Übercharge value label near the crosshair, popular custom crosshairs, etc. — see screenshots for more info. I do it for myself, but maybe someone will find it useful too.

Credits

Omnibombulator for the amazing HUDS.TF,
Teamfortress.tv community

Special Thanks

To all Improved default HUD users