Where can I find the current version of nmon2rrd? (v21 or newer)

nmon-wiki [ https://nmon.sourceforge.net/pmwiki.php ] 

points to developer works [ http://www.ibm.com/developerworks/wikis/display/WikiPtype/nmon ] which is dead...

nmon2rrd is very old.
This was finished in 2013, so I have removed the reference from the website.
Thanks for pointing it out the duff link.

RRD tool is seen as very "old school" and inflexible (IMHO) these day.  The graphs are very "retro" in style.

I strongly recommend you try nmonchart for beautiful graphs that you can view your nmon files in your web browser.

Or move to the new tool njmon, where the data is saved to a time-series data base like InfluxDB (no more 1000's of nmon files to manage) and flexible live graphing with Grafana.

If you are attempting Capacity Planning or Server Consolidation, I recommend nsum to pull out the key stats of 100's of nmon files. Actually update this morning!
See https://www.ibm.com/support/pages/just-got-sent-1000s-nmon-files-help-nsum-rescue

Or the YouTube https://www.youtube.com/watch?v=ZibgIWD3Pr8

Cheers, @mr_nmon