Modly is an open-source desktop app from Lightning Pixel (Windows, Linux, Apple Silicon macOS; v0.4.3; MIT plus an attribution clause) that turns a photo into a usable 3D mesh with open models running on your own GPU, so inference never leaves the machine. An Electron shell supervises a Python FastAPI backend bound to 127.0.0.1:8765. The default model is TripoSR (about 2.4 GB); Hunyuan3D 2 Mini, TripoSG and Trellis2 GGUF arrive as extensions, where an extension is a GitHub repo with a manifest.json that can declare multi-repo model_sources, shared weight_groups and separately installable weight_variants carrying size_gb and vram_gb. Generation is expressed as a node-graph workflow (Image to Generate Mesh to Add to Scene), scenes follow the modly.scene-manifest.v1 contract, and export covers glb/stl/obj/ply with a dedicated stl/obj printing path that scales to millimetres for OrcaSlicer. Three agent surfaces ship in the repo: a stdlib-only JSON-first CLI with its own SKILL.md, an MCP server exposing nine modly_* tools, and an in-app tool-calling agent that can run on a local llama.cpp GGUF pool or an external model endpoint. AMD ROCm auto-detection, memory-budgeted Apple Silicon workflows and headless Jetson runs are documented with measured numbers.
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