Beats - Beats is the platform for single-purpose data shippers that is installed as lightweight agents and send data to machines to Logstash or Elasticsearch.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Syslog-ng - Syslog-ng decreases the quantity and improves the quality of data, thus enhancing the capacities of your SIEM solution.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Fortinet FortiAnalyzer - Fortinet FortiAnalyzer is a powerful product for Security Fabric Analytics and Automation.
iTerm2 - A terminal emulator for macOS that does amazing things.