engine for publishing spatial data and services on the web; written in C. Geomajas – Development software for web-based and cloud based GIS applications. GeoServer – Allows users to share and edit geospatial data. Written in Java using GeoTools. deegree – Java framework PyWPS – implementation of the OGC Web Processing Service standard, using Python Client GeoMoose – JavaScript Framework for displaying distributed GIS data. Mapbender – Framework to display, overlay, edit and manage distributed Web Map Services using PHP and JavaScript. MapGuide Open Source – Platform for developing and deploying web mapping applications and geospatial web services. Windows-based, native file format. MapFish – Framework for building rich web-mapping applications based on the Pylons Python web framework. OpenLayers – AJAX library (API) for accessing geographic data layers of all kinds. Specification Tile Map Service (TMS) – a specification for tiled web maps. Metadata Catalog GeoNetwork opensource pycsw – Lightweight metadata publishing and discovery using Python. Content Management Systems GeoNode Outreach Projects Geo for All – Network of educators promoting Open Source geospatial around the world. OSGeoLive – Bootable DVD, USB thumb drive or Virtual Machine containing all OSGeo software. OSGeo4W – a binary distribution of a broad set of open source geospatial software for Windows Retired Projects Community MapBuilder Events OSGeo runs an annual international conference called FOSS4G – Free and Open Source Software for Geospatial. Starting as early as 2006, this event has drawn over 1100 attendees (2017 Boston) and the tendency is to increase this number every year. It is the main meeting place and educational outreach opportunity for OSGeo members, supporters and newcomers - to share and learn from one another in presentations, hands-on workshops and a conference exhibition. The FOSS4G ribbon, part of every FOSS4G event logo, symbolizes the flow of ideas, innovation, and sharing within the Open Source geospatial community. The event history dates back to an important face-to-face meeting of the 3 original founders of the event (Venkatesh Raghavan, Markus Neteler, and Jeff McKenna), who met initially in Bangkok Thailand in 2004, and planned to create a new annual event for the whole Open Source geospatial community, with the event named "FOSS4G"; the event would go on to help change the history of the geospatial industry. There are also many regional and local events following this FOSS4G philosophy. Community The OSGeo community is composed of participants from everywhere in the world. , there were