Tools

String transforms – each tool is its own inverse or a paired encode/decode:

• transform – visual threading-macro pipeline: chain transforms, see every intermediate value, reversibility indicator
• rot13 – Caesar cipher by 13; its own inverse
• base64 – Base64 encode/decode
• url-encode – Percent-encoding for URLs

Generators:

• QR code – generate QR codes as SVG, inline, no server

Algorithms:

• dijkstra explorer – algebraic path problem: one solver, three semirings (shortest, rainwater, widest)
• trapped rainwater – elevation map to retained water volume; O(n) two-pointer, SVG visualization

Research:

• marginalia – annotation workspace: paste an org-mode document, view property-drawer annotations as cards, edit verdicts, download updated source

Observability:

• crowsnest – read-only dashboard for local LLM agent telemetry; probes a localhost crowsnest/lapdog proxy (default :8127) for live traces, falls back to a demo simulator. Add ?demo=1 to force demo mode

Editors:

• pasted file editor – paste/drag-drop file editor (adapted from Simon Willison)