This is a shared resources for maintaining a list of regular expressions for robots/spiders that should be excluded when counting usage (i.e., "views" or "downloads") of scholarly resources such as journal articles, issues, chapters, etc.  The initial list is taken from [Project COUNTER](http://www.projectcounter.org/) and reorganized by [PLOS](http://www.plosone.org/static/robotsFilter) for bots actually seen.  Contributions to this list (additions or corrections) are welcome via pull requests.