Here are some of the Brave verified charity and non-profit initiatives that are out there. While there definitely are others these are just a handful that interest me personally.

codetoinspire.org [potentially no longer verified*] - Teaching women in developing countries to code, which empowers them to step into careers and be role models for the next generation of women.

pencilsofpromise.org [Uphold*] - Building schools, supporting teachers, and creating hygienic water infrastructure in developing countries.

monafoundation.org [Gemini*] - Supporting children's education and gender equality in economically disadvantaged communities.

fightforthefuture.org [Uphold*] - A collective of activists trying to ensure that technology is used as a tool for empowerment, not oppression.

watsi.org [potentially no longer verified*] - Crowdfunding life-saving medical treatments in low-income countries.

rainforestfoundation.org [Uphold*] - Saving South American rainforests through community training and advocacy.

khanacademy.org [Uphold*] - Providing free online education to everyone, at their own pace.

freecodecamp.org [Uphold*] - Free online training in many aspects of computer programming.

* Site's linked exchange - you can only tip those sites that are also linked to the same exchange as you. A site linked to a different exchange will appear unverified to you.