A white cat tangled in a ball of wool, in a blue circle. The joke being that Yarn was meant to untangle dependency management, and the mascot is thoroughly caught in it.
Printed and shipped by the marketplace. Prices and delivery vary by region.
BABEL hand-lettered in yellow marker, deliberately rough. A compiler logo that looks like it was scrawled on a whiteboard, which suits a tool most people never think about.
Flow's angular F in overlapping yellows and oranges. Meta's other type checker, comprehensively beaten by TypeScript, and increasingly a collector's item.
The yellow square with two black letters. No foundation designed it and no one owns it — the community adopted a logo somebody posted on GitHub and never looked back.
The dark red jester's hat, bells and all. Testing framework branding rarely bothers with a character; Jest committed to the pun and drew the whole hat.