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Codechef is an unacademy initiative. Started in 2009.
Vision -is for all Indian programmers to be among the best in the
globe
It is where we can show out computer programming skills
HackerRank is a tech company that focuses on competitive programming
challenges for both consumers and businesses.
Developers compete by writing programs according to provided
specifications.
HackerRank categorizes most of their programming challenges into a
number of core computer science domains,
including the management of databases, mathematics, artificial
intelligence, among other subjects.
Topcoder (formerly TopCoder) is a crowdsourcing company with an open
global community of designers,
developers, data scientists, and
competitive programmers.
Topcoder pays community members for their
work on the projects and sells community services to corporate,
mid-size, and small-business clients.
HackerEarth is an Indian software company headquartered in San
Francisco, US,
that provides enterprise software that helps organisations with their
technical hiring needs.
HackerEarth is used by organizations for technical skill assessment
and remote video interviewing.