nxlog - NXLog offers log management solutions for companies of all sizes.
AWS Shield - AWS Shield is a managed Distributed Denial of Service (DDoS) protection service that safeguards web applications running on AWS.
Kiwi Syslog Server - Kiwi Syslog Server prvides solution to centralize and simplify log message management across network devices and servers.
Syslog for windows - This is another syslog for windows, it includes daemon and client. Features: RFC 3164-compliant;
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
Rapid7 Nexpose - Network vulnerability and risk management solution.