The things we make
Product Families
Distinct personalities. A shared sense of care. Explore the brands and products growing under the Plum Tree canopy.
Coloring books & keepsakes
Once Upon a Line
Personalized coloring books turn family photos into pages to color and keep. Themed books make it easy to start with a little everyday creativity.
Meet Once Upon a Line
Independent games
Butterbug Games
An independent game studio creating playful worlds, from thoughtful puzzles to cozy gardens, with a soft spot for curiosity and discovery.
Meet Butterbug Games
Engineering-informed product design
Ekistica
Engineering-informed product design across clean-energy infrastructure, industrial software, and everyday goods. Concepts are tested against physics, cost, and real demand before they move onto a roadmap.
Meet EkisticaFor founders, partners, and good ideas