An un-summarized change.

tools/doctools.page

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+---
+format: markdown
+toc: false
+title: Documentation Tools
+...
+
+## Lightweight Markup
+
+* [Pandoc][pandoc]
+* [plantuml][plantuml]
+* [blockdiag][blockdiag]
+* [shaape](https://github.com/christiangoltz/shaape)
+* [ditaa](http://ditaa.sourceforge.net/)
+* [asciidoctor](http://asciidoctor.org)
+
+[pandoc]: http://johnmacfarlane.net/pandoc/
+[plantuml]: http://plantuml.sourceforge.net/
+[blockdiag]: http://blockdiag.com/en/blockdiag/index.html