Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
logstash - logstash is a tool for managing events and logs.
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.