Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Freeplane - Freeplane is a powerful and free software for building mind maps.
AlgoExpert.io - A better way to prep for tech interviews
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Codility - Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.