I want to go open source with restrictions. Ideas?

So I've been an independent software developer for many years. I don't do it professionally, but instead just post the software on my website. Most of it is free and some includes the source code.

I want to make several of my projects open source to allow contributions, but I don't want to allow forks or use in commercial software. I have started writing my own basic software license in professional, but non-legal speak. I want it to be understandable by the average person.

What route do I take and what open source platform can I use?

I don't have any experience with git or repos cause I write all my software alone.

I looked at sourceforge cause I like how they make a professional interface for users whereas github seems more tailored to devs only. It seems like sourceforge does not permit using any non-approved license though 😛 What about bitbucket? I just discovered that one.

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As a side note: I'm incredibly surprised that devs are willing to write open source code and allow it to be used in commercial products. Seems like shooting yourself in the foot.