Klaviyo is email marketing reinvented for various eCommerce stores on Bigcommerce, Shopify, and Magento. With the robust customer profiles built by Klaviyo marketers can target, personalize and optimize email and Facebook campaigns based on their customers behavior. Klaviyo makes it simple for brands and businesses to provide a unique, one-to-one experience for each customer.

H2 is one of the leading open-source relational database management systems written in Java. It can be embedded in Java applications as well as run in the client-server mode. The main programming APIs of H2 are SQL and JDBC, however the database also supports the usage of the PostgreSQL ODBC driver by acting like a PostgreSQL server. The database engine delivers features like a browser based console application or  a small footprint around 1.5 MB jar file size.