UI Faces - Avatars for design mockups
IT Tools - IT Tools is a free and open-source collection of handy online tools for developers & people working in IT.
Nucleus UI - Free UI component library to create mockups in Figma quickly
Workflowy - A better way to organize your mind.
lstore.graphic - Mockup Scene Creator
Wrangle Business Process Management - Wrangle fixes broken processes — making sure everyone knows the steps, whose turn it is, and what got done.