Radare project started as a forensics tool, an scriptable commandline hexadecimal editor able to open disk files, but later support for analyzing binaries, disassembling code, debugging programs, attaching to remote gdb servers, ..

A common lisp programmer writes about his projects and the tools he is using.

pkgsrc is a framework for building third-party software on NetBSD and other UNIX-like systems, currently containing over 12000 packages. It is used to enable freely available software to be configured and built easily on supported platforms (which include OS X and Cygwin).

Exploratory programming environment and documentation generator for Common Lisp.

HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.

It allows you to download a World Wide Web site from the Internet to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer. HTTrack arranges the original site's relative link-structure. Simply open a page of the "mirrored" website in your browser, and you can browse the site from link to link, as if you were viewing it online.

MXE (M cross environment) is a Makefile that compiles a cross compiler and cross compiles many free libraries such as SDL and Qt. Thus, it provides a nice cross compiling environment for various target platforms (including Windows).

[WaveDrom] is Free and Open Source online digital timing diagram (waveform) rendering engine that uses javascript, HTML5 and SVG to convert [WaveJSON] input text description into SVG vector graphics.

[WaveJSON] is an application of the JSON (JavaScript Object Notation) format. The purpose of WaveJSON is to provide a compact exchange format for digital timing diagrams utilized by digital HW / IC engineers.

WaveDromEditor is online real-time editor of digital timing diagrams based on [WaveDrom] engine and [WaveJSON] format. The engine using [WaveDromSkin] skin mechanism to render complete picture. Multiple timing diagrams can be embedded into your HTML page as described in [WaveDromPlugins].

GNU SRC (Source Release Collection) provides a simple way to install the latest officially released versions of GNU packages on an existing distribution
The aim is to make it easier to work with sources, and to help with development and bug reporting.

If you need to convert files from one markup format into another, pandoc is your swiss-army knife. Pandoc can convert documents in markdown, reStructuredText, textile, HTML, DocBook, LaTeX, or MediaWiki markup to

HTML formats: XHTML, HTML5, and HTML slide shows using Slidy, Slideous, S5, or DZSlides.
Word processor formats: Microsoft Word docx, OpenOffice/LibreOffice ODT, OpenDocument XML
Ebooks: EPUB version 2 or 3, FictionBook2
Documentation formats: DocBook, GNU TexInfo, Groff man pages
TeX formats: LaTeX, ConTeXt, LaTeX Beamer slides
PDF via LaTeX
Lightweight markup formats: Markdown, reStructuredText, AsciiDoc, MediaWiki markup, Emacs Org-Mode, Textile

ditaa is a small command-line utility written in Java, that can convert diagrams drawn using ascii art ('drawings' that contain characters that resemble lines like | / - ), into proper bitmap graphics.