ipv6 address management - documentation

[Aaron Gould <aaron1 () gvtc com>]

For years I've used an MS Excel spreadsheet to manage my IPv4 
addresses.  IPv6 is going to be maddening to manage in a spreadsheet.  
What does everyone use for their IPv6 address prefix management and 
documentation?  Are there open source tools/apps for this?

--
-Aaron