Collect Earth Online (CEO) is the next generation web-based platform for geospatial analyses that provides a free, open-source, intuitive interface for accessing and interpreting high-resolution satellite imagery through a variety of sources, including Planet and imagery through Google Earth Engine. Users can create questionnaires with varying levels of complexity to suit their needs and have collaborators collect data simultaneously.  

CEO can support a broad spectrum of applications including landscape change, land cover monitoring and deforestation studies. Researchers, practitioners, public servants, and other stakeholders of all technical levels can make use of CEO as a user-friendly tool to collect data on earth observations at scale. 

Go to CEO

CEO is open source.
Its source code is available on GitHub