Octopussy.pm - Octopussy, Log Management Solution
log4net - log4net is a tool to help the programmer output log statements to a variety of output targets.
Quest InTrust - Event log management software. Monitor real-time logs from numerous data sources in a single pane with our log monitoring tool, InTrust.
Serilog - Backend Development and Utilities
WhatsUp Log Management - WhatsUp Gold Log Management lets users monitor, filter, search and alert on syslogs and Windows logs as well as meta trends like log volume changes.
Logmatic - Logmatic is a log centralization, analytics & visualization platform to improve software & business performance.