ARS — post-installed rebar connection design
ADIT Ltd (ADIT)
Designs post-installed reinforcement connections between concrete elements.
Get it from the vendorA good place to start
FastStone Image Viewer
FastStone Soft
An image browser and editor with side-by-side compare, batch convert and rename and annotation — free for personal and educational use.
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ConSteelSoft — structural steel connection design
ADIT Ltd (ADIT)
Designs bolted and welded connections in structural steelwork.
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Cascade Studio
Johnathon Selstad (zalo)
Parametric solid modelling in the browser through JavaScript code on the OpenCascade kernel, with STEP, STL and OBJ export.
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STRUCTSOFT — 2D Structural Analysis
ADIT Ltd (ADIT)
Plane frame and truss analysis in the browser — forces, displacements, diagrams and steel design.
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Docling
Docling Project (originally IBM Research)
Open-source tool that converts PDF, DOCX and scanned images to Markdown or JSON, with table structure recognition and OCR, running locally.
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STEELSOFT — steel connection design
ADIT Ltd (ADIT)
Designs connections and fixings for steel structures.
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Arduino IDE
Arduino
The official IDE for Arduino boards — write code, upload it to the board and watch sensors on the serial monitor.
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AAS — concrete anchor design
ADIT Ltd (ADIT)
Designs anchors into concrete for the full range of failure modes.
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Calcpad
Proektsoft EOOD
Engineering calculation sheets: write formulas with units in plain text and get a formatted calculation report. A free Mathcad alternative.
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RAILSOFT — railing and balustrade anchor design
ADIT Ltd (ADIT)
Designs railings and the anchors that hold them.
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thermo
Caleb Bell
A Python library for thermodynamic properties and phase equilibria of thousands of chemicals and mixtures: equations of state, activity models and flashes.
Get it from the vendorThree grades of free
Not every free is the same free. Every tool here belongs to one of three grades, and the full licence terms are on its page.
644Completely FreeThis is the heart of the guide: software anyone can download and use at full capability, including for paid commercial work, with no time…41Limited Free VersionThe free version is open to everyone — there is no eligibility test — but it is reduced compared to the full product. The…29Free for Eligible Users OnlySoftware in this category is free only for those who meet an eligibility condition: students and staff of a recognised institution, or personal non-commercial…