Ask HN: What are some developer tools that you would pay for?

By tools, if you mean IDE's, I'd say Brackets or Sublime Text are worth at least $10. If you can broaden to API's & SDK, the one I'd pay for is Google Maps.

That's funny because they are charging USD $70

I meant to say - if you were to buy a developer tool (not currently existing), what functions would you want?

I would buy a software which memorizes my programming habits and makes proposals while coding

IntelliJ.

(OK, I wouldn't personally pay for it, because I don't do enough Java work on my own. But for a company job, I'd push my company pretty hard to get it. And if I did a startup where it would be useful, I'd buy it.)

I'm considering paying for CLion, but I am still on the fence about it.

Perhaps someone in this thread can tell me whether CLion is everything they dreamed of and more. It's hard for me to evaluate something fairly in 30 days.

JRebel is awesome and well worth the price ($365/yr). Especially when iterating on a complex and messy JSF UI it really saves time on repackage/deploy cycles.

A smoother Quiver (http://happenapps.com/#quiver) for Windows

Sublime Text 2. I love its simplicity! Even using IDE's at work, sometimes you need a fast text editor with syntax highlighting.