OpenCollective is a relatively new fundraising platform for free/open source projects (they even have GitHub bot to help with fundraising). What’s unique about it is that the funding and spending of donations are transparent. This means that if a company donates $100,000 to a project, it appears on that project’s Open Collective page. When the project spends that money, it appears as well. Free/open source projects that use Open Collective are “opening the books” and making sure project funds are appropriately spent on maintenance and improvement of the project. The funds can be used to hire more developers or to pay contributors to the project (as ESLint is going to be doing).