All the ones I have signed only claim IP directly related to the company's business model. Obviously that gets trickier if the company is like, Microsoft which

All the ones I have signed only claim IP directly related to the company's business model. Obviously that gets trickier if the company is like, Microsoft which at least has tried to make every kind of software imaginable. But most companies do pretty much one thing, and I am free to develop whatever else besides that on my own time. It seems reasonable.