Customer Feedback Portal - Ask customers what you should build next

ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.

Feedback Tools - Curated directory of tools for getting all the feedback

Apache Airflow - Airflow is a platform to programmaticaly author, schedule and monitor data pipelines.

Feedback Fish - Collect feedback & make your customers happy.

Pushwoosh - Mobile-inspired customer engagement platform for high achievers