Contribute so that my knowledge can bring growth to the Knowledge ? Backend languages: C, PHP, Python and Ruby. Frontend languages: HTML, CSS and JavaScript. ? Database management systems: MySQL, PostgreSQL, Oracle and MongoDB. ? Backend frameworks: CodeIgniter and Ruby on Rails. ? CSS frameworks: Bootstrap and Materialize CSS. ? Agile framework: Scrum. ? JavaScript code interpreter: Node.js. ? JavaScript library: jQuery. ? JavaScript superset: TypeScript. ? CSS preprocessor: LESS. ? ETL Tool: Oracle Data Integrator. ? API documentation tool: Swagger. ? Version control system: Git. ? Source hosting platform: GitHub and GitLab. ? Software: AutoCAD.