Reliable tools. Free to use, forever.
Practical tools built for real work. Each one is a single file that runs in your browser: no install, no account, and it works offline.
Steel Section Database
v1.0 · FreeDimensions, section properties and a dimensioned, to-scale drawing for hot-rolled, hollow, cold-formed and built-up steel sections, from eight regional standards.
- SAISC, AISC, EN / UK, AS/NZS, IS 808, JIS, GOST and GB/T section tables
- Drawings with axes, centroid and, for channels, the shear centre; tapered flanges, fillets and radii drawn as tabulated
- Full property tables in each region's own code notation, with key properties up top
- Values checked against section geometry and the relationships between properties
- Typical steel grade and availability notes for each member type
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Solar Payback Estimator
Free downloadA rough system cost, 20-year savings and break-even point for a home solar system in South Africa, simulated hour by hour over a typical weather year.
- Typical weather years for 11 South African cities
- North, east and west roof arrays with their own tilt, plus battery storage
- Your tariff, fixed charges and yearly increases
- Break-even, net return, IRR and present value, with a 20-year cash-flow chart
- Print or save the results as a PDF
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