How do you commercialize open-source products? While at NDC Porto, Carl and Richard talked to Victoria Melnikova about her work with Evil Martians, helping startups make open-source products and make a living at the same time. Victoria talks about various revenue strategies, but always with a mind to providing a "forever free" tier to be responsible to the open source community. Charging for pro-features, limiting the number of uses before a paid tier... there are several approaches to revenue that users can work with, as long as you are open and honest about how things work!