You could make one "company" (which is just a few bits of paperwork) and then sell all the tools. That being said, selling to developers is hard, you have to a

You could make one "company" (which is just a few bits of paperwork) and then sell all the tools. That being said, selling to developers is hard, you have to add a lot of value / save a lot of time before they're willing to pay. Or you need to solve a problem enterprises have at scale where your solution is cheaper than building it themselves. Honestly, the only way I've seen people turn stuff like what you describe into income is giving it away for free, and then hoping it gets so popular that it gets you a better paying job.