Active Admin

The administration framework for business critical Ruby on Rails applications.

20 Alternatives To Active Admin

Apache Tika

Apache Tika toolkit detects and extracts metadata and text from different file types.

DBeaver

DBeaver - Universal Database Manager and SQL Client.

HeidiSQL

HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
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MongoDB Compass

The easiest way to explore and manipulate your MongoDB data
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MySQL Workbench

MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.

Sequel Pro

MySQL database management for Mac OS X
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code-prettify

Code Prettify is an embeddable script that makes source-code snippets in HTML prettier.
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phpMyAdmin

phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web.