Only if it makes business sense to do so. For a long time, I used to give out free Twiddla licenses to students and teachers. It generated a ton of good word

Only if it makes business sense to do so. For a long time, I used to give out free Twiddla licenses to students and teachers. It generated a ton of good word of mouth referrals and established it as something that people use in the classroom. Now that I'm charging again for those licenses, I sell quite a bit more because of that positioning. I occasionally get non-profits asking for free licenses too, and I always say no. There is no upside like there was with .edu, so it just amounts to giving things away for free. A non-profit is an organization with a budget that they can spend on things like software. Your software has a price, so they get to pay it. Tell them as much and they will understand.