github is where over 100 million developers shape the future of software, together. contribute to the open source community, manage your git repositories, review code like a pro, track bugs and features, power your ci/cd and devops workflows, and secure code before you commit it.

stack overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers.

since 1983, developing the free unix style operating system gnu, so that computer users can have the freedom to share and improve the software they use.

well organized and easy to understand web building tutorials with lots of examples of how to use html, css, javascript, sql, python, php, bootstrap, java, xml and more.

a computer science portal for geeks. it contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview questions.

make the impossible, possible with trello. the ultimate teamwork project management tool. start up a board in seconds, automate tedious tasks, and collaborate anywhere, even on mobile.

atlassian's team collaboration software like jira, confluence and trello help teams organize, discuss, and complete shared work.

datalife engine (dle) — система управления сайтом и контентом. официальный сайт многопользовательской новостной cms для организации сми. движок для сайта.

this converter is used to convert excel (or other spreadsheets) into markdown table. it's also easy to make, create and generate markdown table online via table editor.