CartoDB - Easy data mapping tool
See also Geovisualisierung.
CartoDB - Tipps & Tricks
How to edit SQlite DB concurrently with CartoDB and QGIS
If you want to update SQlite/Spatialite DB concurrently with QGIS and TileMill load the SQlite file first into TileMill, locate the file which TileMill creates when importing and choose this one for editing in QGIS.