Available here: https://github.com/CZDanol/DNLTray

Ultimate modular organizer system.

Contains:

• Trays with compartments (boxes without top)
• Shelves (boxes without front side)
• Drawers with compartments
• Frames for mounting to wall
• and more

Features:

• Highly modular
• Both horizontally and vertically stackable
• Many internal compartment patterns
• Many possible sizes
• Everything is inter-compatible
• No supports required
• Open-source, you can easily customize it or create your own specific organizers

Thousands of models, all completely free. There is a gallery in the models/ folder where you can see previews of all the stuff.