free tool to do basic color correction? I'm creating some basic advice videos, which are explicitly intended to be produced quickly.  I'm using a low-grade webcam to do video captures and don't have any special lighting.  I don't need my videos to be beautiful, and don't want to put too much effort into correcting them, however, I am annoyed by my 'digital jaundice'.

I'm looking for a simple and free tool which can help me remove the yellow shade.  I don't need power, I'm not willing to pay anything, and I'm not willing to put in too much effort into correcting the color before I give up and post videos as a lost Simpson character :).  It seems like there should exist a simple open source tool for exactly this use case.  Can anyone recommend a free tool?

I'm sorry if this is a repeat question.  I feel like I should be able to figure this out on my own without asking, but I've honestly spent time googling and looked through this site and haven't been able to find the information, perhaps because on this site everyone has way more domain knowledge, the one question i did find that seemed to address this question the answer went over my head lol.

Edit:  It turns out I didn't need any tool.  Youtube has built in an ability to adjust your lighting after uploading a video.  It's not very fancy, but it's enough for my needs, simple to use, and most of all it's fast because it utilizes 'the cloud'.  Still, thank you for your feedback
The cheapest tool is to use a desk lamp and light the scene better to begin with and use the white balance setting in the webcam software itself.  It's a lot harder after the fact (if sufficient detail is even saved in the video to fix it at all).  

You could also try DaVinci Resolve Lite, it's a professional color grading and correction package that also happens to be completely free, but the much better solution is to light and shoot correctly rather than trying to fix crappy footage in post.