Add services/ascii-art-and-diagramming.md

services/ascii-art-and-diagramming.md

+### Online
+
+These are direct links to decent tools.
+
+- [WWW SQL Designer](https://ondras.zarovi.cz/sql/demo/?keyword=default)
+- [WebSequenceDiagrams](https://www.websequencediagrams.com/) - very good
+- [js-sequence-diagrams](https://bramp.github.io/js-sequence-diagrams/) - also very good, and client-side
+- [Railroad Diagrams Generator](https://www.bottlecaps.de/rr/ui)
+- [viz.js](http://viz-js.com/) - online graphviz
+- [PlantText UML](https://www.planttext.com/) - online PlantUML
+- [markdeep](https://casual-effects.com/markdeep/)
+- [asciiflow](http://asciiflow.com/) - creates asciiart diagrams for you without hassle
+
+### Offline
+
+ - graphviz
+ - [mermaid](https://mermaidjs.github.io/) - look for the CLI
+ - [PlantUML](http://plantuml.com/)
+ - groff with [Pic](https://en.wikipedia.org/wiki/Pic_language)
+ - http://ditaa.sourceforge.net/
+ - https://metacpan.org/pod/distribution/App-Asciio/lib/App/Asciio.pm
+
+### Text 
+
+ - [FIGlet](http://www.figlet.org/) 
+ 
+### Lists of tools
+ 
+There might be some value in looking here for more links:
+
+- https://en.wikipedia.org/wiki/Syntax_diagram
+- https://news.ycombinator.com/item?id=19406202
+
+### Other
+
+In-browser image manipulation:
+
+- http://snapsvg.io/