I want to create a complete **Map application** with the facilities of edit geometry and attributes of layers. The server and client for the application should be some **open source tools**. The application need to run with **Windows Phone 7, iOS and Android**.
Please give me suggestions on the Open Source Tools selection for my development. As a first step i am planning to start with Windows Phone 7.
QGIS is an open source GIS software, and they may have some development tools that are useful. You can get it https://qgis.org/en/site/ I would reach out to them and ask for their advice. Additionally, https://gisgeography.com/free-gis-software/ provides tools, and https://www.gislounge.com/open-source-gis-applications/ GIS Lounge is a great place to meet professionals in the space. Linkedin has quite a few groups, some of which I frequent where you might find some assistance (if the aforementioned web links do not help). ArcGIS is not open source, but also has development tools, and with the personal use license, it is now much more accessible to the average person.