Educate yourselves on how to be anti-racist. Educate your friends, families and colleagues on how to be anti-racist. Elect district attorneys, judges, and local officials who are anti-racist.
Stop being apathetic. Silence in the face of oppression of your fellow countrymen is implicit consent.
It's not a tech problem. Programmers can start, like every other human being, with empathy and examining their own assumptions, biases, and bigotry. Since there's no global community of programmers, and it's a skill or a job rather than an identity, I think you're asking a meaningless question.
Programming is a skill, and produces tools - tools that help people communicate, inform, solve problems, and more.
(Also, no global community of programmers? Maybe not a single overarching one, but there definitely is one.)
I suppose programmers can take some credit for putting cameras in cell phones, but the people using those to document and prosecute racism are not the programmers. I’m sure we’ll see a flurry of apps to track police abuse or something, but I don’t think those will make any difference, because the problem isn’t “not enough software.”
Use your software skills to help activists instead and do not work for the enemy.
[0] https://boingboing.net/2019/07/12/leaked-palantir-gotham.htm...
[1] https://www.vice.com/en_us/article/9kx4z8/revealed-this-is-p...