RectLabel is an image-annotation tool to label images for bounding-box object detection.
- Create a label dialog from JSON settings
- Layer order for overlapped boxes
- Zoom in on a point
- Quick zoom to existing boxes
- Draw a box including outside the image
- Smart guides for creating and transforming boxes
- Support the PASCAL VOC format
Note: While the software is classified as free, it offers in-App Purchases.