For years now ConSol has been a well-known name in the Nagios environment and has a lot of experience with projects of different sizes - from SMEs to major corporations. Its portfolio ranges from design to implementation to operation of monitoring systems.
Many add-ons and plugins are proprietary developments, whose requirements resulted from experience - e.g. Mod-Gearman, jmx4Perl, check_oracle_health, Thruk, check_logfiles, check_hpasm and many more.