Software that exports AAVSO format

• PC Obs (windows only) - By Lenny Abbey (the PC Obs page is currently down)
  
• Excel Spreadsheet - By Erwin van Ballegoij based on Gary Poyner's sheet

Exports to Extended Format:

• AIP4Win Version 2.2.0
• MaxIm DL (version 5.03)
• MPO Canopus - By Brian Warner
• AstroMB: Computer Aided Astronomy
• VPHOT - for images taken with GRAS
• Mirametrics