Mapbox - An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
QGIS - QGIS is a desktop geographic information system, or GIS.
music21 - Music21 is a Python-based toolkit for computer-aided musicology.
OpenStreetMap - OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
DaCapo Editor - DaCapo Editor is a free Open Source music sheet editor which allows to easily create nice looking partitions. It is available as a web application as well as a desktop application for Windows, MacOS and Linux.