CThruView Transparent Image Viewer - CThruView is a free transparent image viewer that allows mouse clicks to go through the image.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
LayerX - An intuitive app to display transparent images on screen.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
PixelPerfect - Allows developers to put a semi-transparent image overlay over the top of the developed HTML and...
Slack - A messaging app for teams who see through the Earth!