Personal use ≠ unlimited rights
Read the source license. Personal/internal-use grants may prohibit selling software; noncommercial cost datasets may not be used for paid estimating. Hosted apps may require payment even for private use.
CONSTRUCTION TECHNOLOGY · OPEN SOURCE & PERSONAL USE
Estimate smarter.
Build with open tools.
A practical directory for estimators, quantity surveyors, and contracts professionals. Discover tools for PDF takeoff, BIM quantities, BOQs, cost rates, contract controls, earthworks, AI skills, and MCP servers.
INDEPENDENT DIRECTORY Tools belong to their original authors; this page does not mirror, install, or claim ownership of third-party software. Listings include open source, personal/internal-use grants, noncommercial datasets, and hosted or license-unclear references. Licenses and account requirements are shown on each card.
workflow.preview
$ input drawings.pdf / model.ifc
→ quantity takeoff area · length · count
→ unit-rate build-up labor · material · plant
→ cost estimate BOQ · revisions
→ contract controls variations · payments
✓ Traceable quantities. Reviewable assumptions.
Example workflow, not an automated end-to-end service.
65Curated resources
07Areas of work
100%Linked to original authors
2026Last research year
DISCOVER · FILTER · EVALUATE
Browse the toolkit
Search for a task, select a category, and filter tools by usage rights and installation requirements before trying them.
Source-reviewed index
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USE RESPONSIBLY
Before you host, fork, or use a tool on a live estimate
Calibrate and reconcile
Check sheet scales, units, overlaps, deductions, IFC classifications and quantities against source drawings. Automated results are not certification.
Price for the right project
Rate libraries are not automatically current market quotations. Validate date, locale, labor productivity, tax, freight, waste and scope before pricing a bid.
Preserve governing terms
Contract-control tools do not decide FIDIC entitlement. Engineer instructions, variations, time bars and payment procedures require the actual signed contract and supporting records.
Why some projects are not copied here
Previously omitted resources are now included as clearly labelled references. AutoConst takeoff skills have personal/internal-use licenses even where their READMEs say MIT. DDC cost data is CC BY-NC 4.0 with attribution. ConstructFlow lists LGPL-3 in files but OPL-1 in its README; verify permission with its author. Hosted MCP services and advertised paid plugins may require an account or purchase. We link to the original source only, and do not mirror restricted code or data.
BUILDING BLOCKS
From curated tools to your own estimating automations
This directory is a first step. Separate original modules could later cover steel quantity/weight libraries, rate buildup sheets, drawing-to-BOQ workflows, and variation logs—with tested units and auditable assumptions.