C Programming - Wikibooks, open books for an open world
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Octave Programming Tutorial
OpenSCAD User Manual
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More C++ Idioms
Erlang Programming - Wikibooks, open books for an open world
Data Mining Algorithms In R - Wikibooks, open books for an open world
Clojure Programming
Elm programming language
https://en.wikibooks.org/wiki/Clipper_Tutorial%3A_a_Guide_to_Open_Source_Clipper(s))
C++ Programming
Application Development with Harbour - Wikibooks, open books for an open world
C++ Programming: Code patterns design - Wikibooks, open books for an open world
An Awk Primer - Wikibooks, open books for an open world
Ad Hoc Data Analysis From The Unix Command Line
GNU Cobol Programmers Guide
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Beginning Elm
A gentle introduction to Elm programming language
A Beginner's Python Tutorial
Introducing ASP
Tidb stable en manual
Mysql tutorial excerpt
Teach Yourself Scheme in Fixnum Days
A practical introduction to the programming language Scheme
https://dtai.cs.kuleuven.be/ppcbook