A quick Google search turns up many websites that claim to make a customized script font from a sample of your handwriting. How do they compare, and would you recommend any such service? Are there online tools (free or open-source preferably) that can achieve this goal?
I've tried Fontifier before and it's worked pretty well.
Hopefully it'll be what you're looking for.
Interestingly, you could also try icomoon. The brilliant result of that would be that you could also use your font online. Hurrah for vectors! http://icomoon.io/