What are some alternatives?
Marketing Optimizer - Optimize conversion rates, increase lead-to-close ratio, and resell leads easily. Includes complete WordPress integration.
RabbitMQ - RabbitMQ is an open source message broker software.
Alexa - Alexa provides analytical insights to benchmark, compare and optimize businesses on the web.
Apache ActiveMQ - Apache ActiveMQ is an open source messaging and integration patterns server.
Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.
Apache Kafka - Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.