Ask HN: Help with picking a semi-restrictive license for a project on GitHub

Hi, I'm having a hard time finding the right license for a project of mine, so I'm hoping to get some pointers from folks here. I want to put a software project on Github. The idea is to put it on Github and have people use it as a tool in running their business. I plan to also make it available as a SaaS product, so I don't want others doing the same. The public should use it as a tool internally, not sell it as a product externally. Finally, I'm not sure what to make of redistribution rights.