Observed arrival · 2026-09-22

Gnomon, an offline workbench for architecture and agent systems

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Editorial interest 84/100 Selection signal · not a rating of the site

Gnomon turns C4 diagrams into STRIDE threat models, provides a notation for agent systems, and renders 109 diagram templates locally.

Landing page captured for the 2026-09-22 issue.

For: Software architects and agent-system designers
Worth noticing: It claims 109 offline templates and runs PlantUML in-process without a Java runtime.

Field notes

The project presents architecture diagrams as analyzable inputs rather than static documentation. Its stated workflow connects C4 structure to STRIDE threat registers, while a separate notation covers agent-system elements and possible run endings. The homepage also lists local PlantUML rendering, editable sandboxed D3 visualizations, and templates spanning ArchiMate, AWS, Azure, ADRs, RFCs, and post-mortems. Windows and Linux support is identified as forthcoming.

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○OpenPublic substance visible

$PaidCommerce or pricing visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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