as much as i hate tech bros that think the solution to every social problem is a new saas app, there are two pieces of tech that would be great for workers:

1) for people that aren't in a union, make labor lawyers easy to use. there could be an app used to walk you through gathering evidence about various workplace violations (osha/safety stuff, wage theft, etc) and then hook you up with lawyers in a two-sided marketplace. workers would get easy represenation, lawyers would get a stream of clients that show up with a nicely formatted bundle of evidence. it could even work to find conneted cases could get bundled into class actions.

2) when everybody worked in the same office/shop floor, you could easily commiserate and start discussions about unionization and collective action. if you're an app-mediated gig-worker (uber drivers, door-dashers, etc) you don't know how to connect with your coworkers. there needs to be a social platform where people would be able to make these connections. to do this, you'd need a way to verify that users are actual employees and put in various protections to make sure management isn't spying on them.