Arlogd provides remote logging. A daemon on a client host watches all fifo's in some directory.
Anything written to a fifo is appended to a corresponding file on the loghost.
It is not necessary to change or reconfigure logging applications ; you can just replace a log by (a symlink to) a fifo.
Serverstats is a simple tool for creating graphs using rrdtool. Serverstats does not have any features to manage the created rrd-files, if you change anything you have to delete and recreate the files. Perhaps you can avoid this using third-party-tools
DirJack is a java written tool to monitor directories in your filesystem. The main feature is to react on changes within a directory i.e. you can define the behaviour what to do when files are added, edited or removed.