deletions | additions       diff --git a/appendix.md b/appendix.md  index 5bf1923..14fab29 100644  --- a/appendix.md  +++ b/appendix.md 
...
* [Github](http://github.com) A web-based hosting service for software development projects that use the Git revision control system, including many open source projects.  * [BitBucket](https://bitbucket.org/) A web-based hosting service for projects that use either the Mercurial or Git revision control systems.   ## Systems to capture package, access,  and run workflows   data, code, workflows, execute data  and article provenance code  * [iPython Notebooks](http://ipython.org/notebook.html) A web-based interactive computational environment where you can combine code execution, text, mathematics, plots and rich media into a single document.  * [ROpenSci](http://ropensci.org/) A suite of packages that allow access to data repositories through the R statistical programming environment.  * [Authorea](https://authorea.com) A collaborative online word processor for scholarly papers that allows the writing of web-native, living, dynamic, "executable" articles which include text, mathematical notation, images, and data. It currently support inclusion and rendering of d3.js and iPython notebooks.