LAMMPS

LAMMPS is a classical molecular dynamics code, and an acronym for Large-scale Atomic/Molecular Massively Parallel Simulator. LAMMPS has potentials for solid-state materials (metals, semiconductors)...
Language(s): C++
Operating system(s): Linux, Mac OS X, Windows
License: GNU General Public License

LedgerSMB

The LedgerSMB project brings accounting software integrating invoicing, order processing, quotations and more (ERP) to small and midsize businesses. Features include: Sales (Invoices, Orders, Q...
Language(s): Perl, PL/pgSQL
Operating system(s): Unix, Linux, Mac OS, Windows, Android
License: GPLv2 General Public License Version 2

LibreCAD

LibreCAD (originally CADuntu) is a free and open-source 2D CAD application, which uses Qt (a cross-platform application framework). The project started around 2010 as a fork of QCAD 2.0.5.0....
Language(s): C++
Operating system(s): Windows, Mac OS, Unix, Linux
License: GNU General Public License

LibreOffice

LibreOffice is a free and open-source office suite, a project of The Document Foundation. It was forked from OpenOffice.org in 2010, which was an open-sourced version of the earlier StarOffice. The Li...
Language(s): C++, XML, Java
Operating system(s): Linux, Windows 7+ (XP and Vista for 5.x), Mac OS 10.9+, Android (Viewer); Unofficial: Free BSD, OpenBSD, NetBSD, Haiku, Solaris (v. 5.2.5)
License: MPLv2.0 (secondary license GPL, LGPLv3+ or Apache License 2.0)

LightZone

LightZone is professional-level digital darkroom software for Windows, Mac OS X, and Linux, that includes RAW processing and editing. Rather than using layers in the way that other photo editors do, L...
Language(s): Java
Operating system(s): FreeBSD, Linux, Mac OS X, Windows
License: BSD license