* 1/26/2011:The Firstfirst public appearance of TurtleBot occurred on January 26th, at the Homebrew Robotics Club.
* 2ROS Answers is introduced on Febuary 15th a Q/15/2011:A IntroductionForum offor ROS Answersusers.<ref>{{cite web|url=http://www.ros.org/news/2011/02/announcing-ros-answers.html|title=Announcing ROS Answers - ROS robotics news|website=www.ROS.org|access-date=12 December 2017}}</ref>
* 4/18/2011:On April 18th Willow Garage announces TurtleBot a hobbyist personal robot kit.<ref>{{cite web|url=http://www.willowgarage.com/blog/2011/04/18/turtlebots-available-preorder|title=ROS on the Move: TurtleBots available for preorder - Willow Garage|website=www.WillowGarage.com|access-date=12 December 2017}}</ref>
* 5/11/2011:On FirstMay pure Java implementation of5th ROS announcedsurpasses at100 [[Google I/O]]repositories.<ref>{{Citecite web|url=http://www.ros.org/news/2011/05/google100-io-2011-cloud-robotics-ros-for-java-and-androidrepositories.html|title=Google100 I/O 2011: Cloud Robotics, ROS for Java and AndroidRepositories - ROS robotics news|website=www.rosROS.org|access-date=2018-11-2412 December 2017}}</ref>
** The 100th repository is rl-texplore-ros-pkg from the [[University of Texas at Austin]]▼
* The first pure Java implementation of ROS announced at [[Google I/O]] on May 11th.<ref>{{Cite web|url=http://www.ros.org/news/2011/05/google-io-2011-cloud-robotics-ros-for-java-and-android.html|title=Google I/O 2011: Cloud Robotics, ROS for Java and Android - ROS robotics news|website=www.ros.org|access-date=2018-11-24}}</ref>
▲** 100th repository is rl-texplore-ros-pkg from the [[University of Texas at Austin]]
* 11/8/2011:The 4th anniversary of ROS and video compilation published on November 8th.<ref>{{Cite web|url=http://www.ros.org/news/2011/11/celebrating-the-fourth-anniversary-of-ros-and-the-first-roscon-2012.html|title=Celebrating the fourth anniversary of ROS... and the First ROSCon 2012 - ROS robotics news|website=www.ros.org|access-date=2018-11-24}}</ref>
