[EsotericAlgo]

Many states also offer an online filing option.

For example, California has CalFile[1] which covers most situations. There are also some options for free federal filing if your AGI exceeds $66,000 as the requirements set by Free File Alliance[2] members vary depending on the offerings (e.g. FreeTaxUSA[3] doesn't have AGI limits).

[1] https://www.ftb.ca.gov/online/CalFile/index.asp

[2] https://en.wikipedia.org/wiki/Free_File_Alliance

[3] https://www.freetaxusa.com/

[pnutjam]

I've been using DIY tax, http://www.freetax.com