How to redirect third party logs to log server in Centos

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http://serverfault.com – I want to setup a simple log server to accept logs from all clients. I am not talking about standard system logs such as /var/log/mail , message, boot etc. I want to redirect or send application logs and they may not be using syslog daemon at all to log their message. Such as /appdir/log/error.log. I ran across many posts on the internet; most suggest using rsyslog or syslog-ng. Well so far I have been able to redirect the standard system logs not the application logs. I am using centos 5/6 environment. (HowTos)