Free
Weka
Free machine-learning workbench
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Code Compare - free file and folder diff & merge tool, Visual Studio integrated.
Free database tool
A Free Solid Software Program for Managing SQL Server 2005
SQL server express management
Fixing Microsoft SQL Server
Connectivity solution for ODBC-based applications to access MySQL databases
Manage your queries and databases with ease with the SQL Developer
Access fast Tor gateways for free
Free database browser and editor
Manage your SQLite databases more effectively
Free open-source CRM system
Free RTK for microcontrollers