deal.II
deal.II developer community
A leading C++ library for adaptive finite elements, from a laptop to a supercomputer, with dozens of detailed tutorials.
Get it from the vendorOpen source is a sub-category of "completely free": everything here is free to use, and in addition the source code is visible and available.
For an engineer that matters for three practical reasons. You can check what the calculation actually does rather than trust a black box. You can adapt the tool when your problem falls outside the standard. And most importantly — if the project closes or is acquired, the code remains and your working files do not become hostages.
The common licences here are GPL, LGPL and BSD. All permit commercial use; the differences between them concern anyone distributing a modified version of the software, not someone simply using it.
530 results
Deepnest — Part Nesting for Cutting
Deepnest Project
Arranges parts on a sheet with minimum waste, for laser, plasma and CNC cutting.
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Déjà Dup
GNOME (Michael Terry)
Simple, encrypted, scheduled personal backup on the GNOME desktop, to a disk, a network server or Google Drive.
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Dia
GNOME Project
A diagram editor for flowcharts, network and process drawings.
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diagrams.net (draw.io)
JGraph
A full diagram editor in the browser, with no account required.
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diff-pdf
Vaclav Slavik
Visual comparison of two PDF versions — see at once what changed between revisions of a drawing or report.
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digiKam
KDE community
Management of a large photo archive with tags, face recognition and metadata, plus a built-in image and RAW editor.
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Digital — logic simulator
Helmut Neemann
Build a logic circuit and watch it run — with export to VHDL and Verilog.
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Ditto
Ditto project
Clipboard history for Windows — everything you copy is saved, so earlier values and text can be found and pasted again.
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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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docTR
Mindee
Open-source deep-learning OCR library: text detection and recognition in PDFs and images, including rotated pages and table region detection.
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Double Commander
Double Commander team
Two-pane file manager in the Total Commander style — batch rename, archives, content search and FTP.
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Drake
Toyota Research Institute (originated at MIT CSAIL)
A C++ and Python toolbox for robot dynamics — multibody simulation with contact, optimisation and control design.
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Dune 3D
Dune 3D Project
A new parametric 3D modeller built around constrained sketching.
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Duplicati
Duplicati Inc. and community
Encrypted, incremental, scheduled folder backup to cloud storage, SFTP, a NAS or an external drive, with a friendly browser interface.
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DWSIM
DWSIM Project
Steady-state and dynamic process simulation for chemical plants.
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DXF2GCODE
DXF2GCODE Project
Converts DXF drawings into G-code for milling, plasma or laser cutting.
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EasyOCR
Jaided AI
Simple Python library for recognising text in images in more than 80 languages, with each word’s position and confidence — in a few lines of code.
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Eclipse 4diac
Eclipse Foundation
Open-source environment for distributed automation to IEC 61499: function block network design, deployment to controllers, monitoring and debugging.
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Eclipse Papyrus
Eclipse Foundation
An open-source UML and SysML modelling environment with diagram editors and profiles, for requirements, architecture and model-driven design.
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Electric VLSI
Static Free Software
An IC and schematic design system covering layout, schematics and simulation links.
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Elements
Big Ladder Software
Free open-source editor for building energy simulation weather files (EnergyPlus EPW and DOE-2), preserving psychrometric relationships.
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Elmer FEM
CSC — IT Center for Science, Finland
Multiphysics FEA — solids, flow, heat and electromagnetics — with its own graphical interface.
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EnergyPlus
US Department of Energy
Annual building energy simulation — envelope, HVAC, thermal comfort and daylight. The US DOE engine.
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