Software
You can access the tool at: https://yutingzhang.github.io/doc-bg-remover/
This tool allows you to upload (or drag-and-drop) an image or PDF file, then modify the background, transparency, gamma, and other settings. It can convert images (or the first page of a PDF) to either grayscale or preserve original colors, optionally applying a binarization process, adjusting a white scale threshold, or controlling transparency.
Z!PickPoint is an open-source annotation software for 2-D image. You can use it to annotate 2-D points. It is simple to use, yet full-featured. My original intention to develop this program is to facilitate computer vision research, such as face alignment. However, it might be also useful for other tasks.
