+<div id="outline-container-sec-2-1" class="outline-3">
+<h3 id="sec-2-1"><a id="ID-c19c5a3b-dfb0-4f7f-961c-a387b925669f" name="ID-c19c5a3b-dfb0-4f7f-961c-a387b925669f"></a><span class="section-number-3">2.1</span> Extensible, programmable computing environment examples</h3>
+<div class="outline-text-3" id="text-2-1">
+<dl class="org-dl">
+<dt> <a href="https://www.johndcook.com/blog/2008/04/27/one-program-to-rule-them-all/">GNU Emacs</a> </dt><dd>At the heart, Emacs is text editor on top of Lisp
+runtime. Data storage and computation can be done in
+<a href="https://www.defmacro.org/ramblings/lisp.html">Lisp</a>. Emacs provides text buffers that can be used to
+build GUI.
+</dd>
+
+<dt> <a href="https://www.eclipse.org/ide/">Eclipse IDE</a> </dt><dd>In essence <a href="https://en.wikipedia.org/wiki/OSGi">OSGi</a> platform with a text
+editor. Computation done in java. Eclipse provides
+integration, runtime and GUI platform.
+</dd>
+
+<dt> <a href="https://en.wikipedia.org/wiki/IBM_Notes">IBM Notes/Domino</a> </dt><dd>Custom database engine, software development
+platform, GUI editor, computation can be done in Java and
+LotusScript.
+</dd>
+
+<dt> <a href="https://en.wikipedia.org/wiki/ABAP">SAP ABAP</a> </dt><dd>Custom database engine, runtime, GUI platform,
+development environment and programming language.
+</dd>
+</dl>
+</div>
+</div>
+</div>