Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Do You Even List? - Auto updating Twitter list of people you interact with most
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Email Parser - Email Parser bridges the gap between the emails you receive and Excel files, Google Sheets and databases. It can capture text from incoming invoices, orders, receipts within the email or the attachments
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Vicariously.io - Create Twitter lists based on the follows of other users