For open-source advocates and privacy-conscious teams looking for a design and prototyping tool, Penpot is the clear choice. Its genuine open-source nature and self-hostability make it ideal if you prioritize privacy and want a collaborative environment built on open standards. However, be prepared for a smaller plugin ecosystem and less polished performance compared to established tools like Figma.
On the other hand, if you're a Mac user focused on keyboard-driven workflows, Rectangle is the way to go. It’s lightweight, free, and offers sensible defaults that enhance productivity without the need for an account or telemetry. Just keep in mind that its advanced features require a paid Pro version, and it doesn't serve those who are not on Mac or those seeking a more comprehensive utility suite.