Moonmoon is a web based aggregator similar to planetplanet. It can be used to blend articles from different blogs with same interests into a single page.
Moonmoon is stupidly simple: it only aggregates feeds and spits them out in one single page. It does not archive articles, it does not do comments nor votes.
Web hosting with PHP5.3 (PHP4 & 5.2 will not work).
Moonmoon is free software and is released under BSD license.
After installation, configuration is kept in a YAML formatted custom/config.yml:
url: http://planet.example.net # your planet base URL
name: My Planet # your planet front page name
locale: en # front page locale
items: 10 # how many items to show
refresh: 240 # feeds cache timeout (in seconds)
cache: 10 # front page cache timeout (in seconds)
cachedir: ./cache # where is cache stored
postmaxlength: 0 # deprecated
shuffle: 0 # deprecated
nohtml: 0 # deprecated
categories: # only list posts that have one
# of these (tag or category)