What’s a good editor for a few photos?

I’ve got a handful of photos from a small product shoot that need cleaning up before I send them to a client. A couple are too dark, one has an ugly reflection in the background, and a few need cropping and some minor retouching. I don’t do this often enough to justify installing a big editing package, so I’d rather use something quick that still gives me proper tools. What would you use for a job like this?