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A very complete internationalization library for Lua with LÖVE support 
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Devilspie2 is a window matching utility, allowing the user to perform scripted actions on windows as they are opened and closed.
Devilspie 2 is based on the excellent program Devil's Pie by Ross Burton. It will read Lua scripts from a folder and run them whenever a window is opened, and the rules in them are applied on the window.
libvips is a demand-driven, horizontally threaded image processing library.
It implements around 300 operations covering arithmetic, histograms,
convolution, morphological operations, frequency filtering, color,
resampling, statistics, and others.
A lightweight, simple, fast, feature-filled, and extremely extensible text editor written in C, and Lua, adapted from lite.
Scientific computing for LuaJIT.
Torch is a scientific computing framework with wide support for machine learning algorithms that puts GPUs first. It is easy to use and efficient, thanks to an easy and fast scripting language, LuaJIT, and an underlying C/CUDA implementation.
As you probably know by now, LÖVE is a framework for making 2D games in the Lua programming language. LÖVE is totally free, and can be used in anything from friendly open-source hobby projects, to evil, closed-source commercial ones.