There are a handful of free tools you can use. We have write-ups of most of them in the "Labeling Your Images Yourself" section here: https://blog.roboflow.com/

There are a handful of free tools you can use. We have write-ups of most of them in the "Labeling Your Images Yourself" section here: https://blog.roboflow.com/object-detection/ https://blog.roboflow.com/object-detection/ Roboflow (our startup) can import the annotation files from all of those tools and convert them to Create ML's format for you.