What are some alternatives?
When comparing BirdFont and SpeedCrunch, you can also consider the following products
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.
FontStruct - FontStruct. Build, Share, Download Fonts
Numi - Numi Organic Tea is a premium, Fair Trade sustainable company specializing in unique and innovative blends of green, black, white, oolong teas, Pu-erh, rooibos, herbal and Flowering Tea™.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
fxSolver - fxSolver is an free online math solver, equation library, graphing calculator and science/engineering problem helper. To get started, add some formulas, fill in any input variables and press "Solve."