Issuetrak - Issue tracking software for help desk and customer service
Apache Airflow - Airflow is a platform to programmaticaly author, schedule and monitor data pipelines.
Deskun - Deskun is a Help Desk system inside Gmail. It enables you to support customers directly from your mailbox, manage projects, and use free features for Gmail.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Kapdesk - Kapdesk offers support teams with a helpdesk software to streamline support tasks.
Pushwoosh - Mobile-inspired customer engagement platform for high achievers