TechBeamers is a tutorials site for beginners to learn Python, Java, Selenium, C, C++, CSharp, Angular, PHP, JavaScript, Agile, Manual and Automation Testing.
ExamTray - ExamTray offers Free Online Tests / Quiz / Exams and Questions and Answers on Aptitude, General English, General Knowledge, Current Affairs, C, C++, Java, Database, Android and Other Programming Languages.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
TutorialsTeacher - TutorialsTeacher.com is optimized for learning web technologies step by step.
draw.io - Online diagramming application
Tutorialzine - Web Development Tutorials & Resources
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.