Do this the same way you'd get more people to buy it, if you were selling it. * Reduce barriers to entry - make sure that your product is easy to find, easy to

Do this the same way you'd get more people to buy it, if you were selling it. * Reduce barriers to entry - make sure that your product is easy to find, easy to install (or to setup an account), easy to use, easy to see its value * Figure out who your ideal user is. Who will get the absolute most value out of your product? * Document exactly how easy it is for your ideal user to get some specific "quick wins" with it. Pick one as your "primary pitch". * Figure out where your ideal user hangs out and describe the "quick wins" from above. Find people who are actively complaining about problems and say "Oh by the way, this easy-to-use free software will fix that for you". * When those users are happy, ask them to tell their friends.