Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
DataGrip - Tool for SQL and databases
Texmaker - Texmaker, free cross-platform latex editor
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.