OpenJUMP
Tips

• When you are drawing polygons, you can draw holes inside edited polygons by holding down Shift.

• You can copy the attribute table to a spreadsheet like Excel (or any program that accepts tab-delimited data). In the attribute window, press Ctrl+A to select all the rows, then press Ctrl+C to copy the data to the clipboard. You can then go to your spreadsheet program and paste in the data.

• If you have a layer containing a single feature that you want to use for the fence, simply rename the layer to “Fence”.

• If you need to pan during drawing: 1) press and hold down the “Shift” and “Alt” keys, 2) pan, 3) release the keys, 4) go on drawing

• If you want to open ECW raster image, find on web ER Mapper ECW drivers (NcsCnet.dll,NCSEcw.dll and NCSUtil.dll) and copy them in Openjump/LIB/EXT folder.
  Those files can be find on ER Mapper web page http://www.ermapper.com/ProductView.aspx?t=28
  as a part of Image Compression SDK. Read carefully the licence for details
  This tip works only with Windows XP/9X.