PhotoFlare - Quick, simple but powerful Cross Platform image editor.
Anima for Figma - Export Figma to HTML/CSS code
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Spline - Design tool for 3d web experiences
showFoto - ShowFoto is the standalone image editor of the digiKam project.
Fotografix - In addition to being totally portable, Fotografix has a ridiculously small footprint.