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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Mailgun is a purely transactional email service for developers. It provides powerful email APIs for you to send, receive and track emails. If you prefer a traditional way of email transfer, you can try Mailgun’s SMTP relay service. It offers 10K email free every month.
Sendgrid puts their emphasis on the Web API, which you can use for sending and tracking emails. But primarily, this service is a cloud-based SMTP provider. Except for email APIs, Sendgrid offers an SMTP API. This allows you to extend SMTP capabilities by adding JSON instructions to emails for additional tracking of events.