Kopia
Kopia project
Encrypted incremental backup with a GUI and scheduling — to local disks or the cloud storage of your choice.
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Kratos Multiphysics
CIMNE
A multi-physics finite-element framework with Python scripting.
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Krita
Krita Foundation (KDE)
Open-source digital painting and illustration: sketches, hand-drawn renderings and illustrations, with many brushes and tablet support.
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ksnip
ksnip project
Open-source screenshots with annotation, the same tool on Windows, macOS and Linux, including Wayland sessions.
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LabPlot
KDE
Data analysis and scientific plotting in a graphical interface — a free alternative to Origin, with curve fitting and FFT.
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Landlab
Landlab team (CSDMS)
A Python toolkit for Earth-surface modelling — erosion, overland flow, sediment transport and landslides on a grid.
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LaserGRBL
Arkypita
G-code sender and image/vector converter for laser engraving and cutting jobs on GRBL-based machines.
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LazPaint
LazPaint contributors (BGRABitmap)
A lightweight image editor with raster and vector layers, including a portable no-install version for Windows.
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LeoCAD
LeoCAD project
Free open-source program for building virtual LEGO brick models — an educational tool for spatial thinking and 3D design.
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LibreCAD
LibreCAD Project
Lightweight 2D drafting with layers, blocks and dimensions, built around the DXF format.
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LibreOffice
The Document Foundation
A full office suite — documents, spreadsheets, presentations and drawings, compatible with Office files.
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LibrePCB
LibrePCB
Modern PCB design with a unified component library — schematic, layout and fabrication files.
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LICEcap
Cockos
Records a screen area straight to an animated GIF, in a tiny program for Windows and macOS.
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Lima VVA
Lima VVA (open-source project)
Road design and earthwork quantities for small and medium projects — alignment, cross-sections and volumes.
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Linkage
David M. Rector
Sketch and animate planar linkage mechanisms — to study motion paths, speeds, gears and cams.
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LocalSend
LocalSend
Send files between phone and computer over the local network, with no cloud or cables — e.g. site photos straight to the PC.
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Logisim-evolution
Logisim-evolution Team
Design and simulate digital logic circuits interactively.
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Logseq
Logseq
Outliner-style notes and a daily journal kept as local text files — for meeting notes, tasks and technical know-how.
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LosslessCut
Mikael Finstad
Cut and join video without re-encoding — fast and with no quality loss, for drone footage, inspections and recordings.
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LTspice
Analog Devices
Fast SPICE simulator with no component limit, unusually strong on switching converters and power circuits.
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LyX
LyX team
A graphical LaTeX-based document editor — theses, papers and technical reports with equations.
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Magic VLSI
Tim Edwards (Open Circuit Design)
A veteran chip layout editor with real-time design-rule checking, parasitic extraction and GDS and LEF/DEF support.
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MapServer
MapServer Project (OSGeo)
An open-source map server for publishing geospatial data and interactive maps on the web.
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MarkItDown
Microsoft
Python tool that turns Word, Excel, PowerPoint, PDF, HTML and EPUB into clean Markdown text with a single command.
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