Amazon Redshift Spectrum vs Mara: What are the differences?
Amazon Redshift Spectrum: Exabyte-Scale In-Place Queries of S3 Data. With Redshift Spectrum, you can extend the analytic power of Amazon Redshift beyond data stored on local disks in your data warehouse to query vast amounts of unstructured data in your Amazon S3 “data lake” -- without having to load or transform any data; Mara: A lightweight ETL framework. A lightweight ETL framework with a focus on transparency and complexity reduction.
Amazon Redshift Spectrum and Mara can be categorized as "Big Data" tools.
Mara is an open source tool with 1.24K GitHub stars and 51 GitHub forks. Here's a link to Mara's open source repository on GitHub.