logstash - logstash is a tool for managing events and logs.
Abacus - Expenses without the 'expense report'
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
PiinPoint - Location analytics made simple.
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
ONDiGO - Seamlessly integrate your email & calendar to Salesforce