KML Multitool is a handy set of tools to process KML files for use with Google Earth, and GPS apps such as Handy GPS. It lets you:

• Convert waypoints and tracklogs between the GPX and KML file formats.
• Create rectangular or hexagonal KML grid cells that can be overlaid on Google Earth.
• Smooth KML tracklogs.
• Merge the waypoints and/or tracklogs from multiple KML files into a single file for easier handling.
• Plot and edit KML files.