Freely useable in non-commercial applications as long as credits to Po-Han Lin and a link to http://www.edepot.com/algorithm.html is provided in source code (whether released to public or not) and the credit and link URL can be seen in running compiled executable. Commercial applications please inquire about licensing the algorithms.

Thanks to Ruud, Gordy, and Eric Grange for tips and pointers. Also to Alexander for the benchmark.

The Extremely Fast Line Algorithm (EFLA) is a homebrew line drawing algorithm that is extremely simple and fast.