Online Geoconverter

Free online converters for geospatial data:

• >> GeoConverter << - Convert from/to many GIS formats, like Shapefile, Interlis 1, etc. (using OGR)
• Ogre] - Convert form/to GeoJSON (using OGR).
• mapsdata.co.uk - Convert Excel to KML, CSV to KML, Shapefile to KML, GPX to KML, KMZ to KML or DXF to KML.

Cloud GIS as converters:

• Geojson.io
• GIS Cloud

Miscellaneous converters:

• Online line simplification: http://www.mapshaper.org/
• Shapefile to GeoJSON converter: http://techslides.com/demos/mapping/shapefile-geojson-converter.html
• http://www.shpescape.com/ (offline?)