logstash - logstash is a tool for managing events and logs.
Cent - A network for Universal Creative Income.
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
Percentages - Easy to use percentage calculator
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
PercentageTools.com - Percentage calculator, online calculates percentage in many situations, simply enter the numbers and get the result and the formula of calculation.