Productroad was bootstrapped and has zero funding so we know how hard it can be to manage the budget of your startup. Indie makers face the problem of lack of paid customers and growing of spends (yeah, we all need to pay for hosting) especially often.
To help small startups and Indie makers we made a free plan. So if you are looking for an open-source or free alternative to UserVoice or Canny our free plan could be a great choice.