If you are looking for nice Windows-only open source photo editor with lots of Paint and Photoshop-like features, I recommend PhotoDemon: https://photodemon.org/. - Source: Hacker News / 3 months ago

Converseen comes to mind: https://sourceforge.net/projects/converseen/ ... PhotoDemon is a fast and open editor with some nice batch functions for conversion: https://photodemon.org/. Source: almost 2 years ago

Marvelapp.com — Design, prototyping, and collaboration, free plan limited to one user and project. - Source: dev.to / 5 months ago

At this stage your main goal should be to prototype it and test it with people to validate the idea. Or at the very least have something people can look at and respond to. Don’t worry about building a coded and working version yet. Start with a clickable prototype which can be built using design tools. Most people use Figma these days but if you’re just starting out you could use something like Marvel, which is... Source: about 1 year ago

Marvelapp.com — Design, prototyping and collaboration, free plan limited to one user and one project. - Source: dev.to / over 1 year ago

Hi, I am doing research on some of the user testing tools out there like lookback.io, Marvelapp.com, maze.design, usabilityhub.com, userbrain.net, usertesting.com, userzoom.com. I would like to know about your experience. Source: over 1 year ago

As far as I can remember, I saw https://marvelapp.com/ doing it to add a prototype to the homescreen. Source: about 2 years ago