freeware applications, free online tools for surfers and webmasters, manuals and articles about internet and data security.

hexed.it, the powerful online hex editor running in your web browser using html5/javascript technology. analyse and edit binary files everywhere.

world's simplest collection of browser-based text processing utilities. generate, convert, replace, filter, encode, decode text, and much more.

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.

online conversion tools for developers. csv, json, sql and javascript. sponsored by flatfile.

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

free tools for code-breaking, solving ciphers and logic puzzles, room escape games, ctfs, cicada 3301 and more.

online decompiler for java, android, python and c#.

encoding and decoding site. e.g. html escape / url encoding / base64 / md5 / sha-1 / crc32 / and many other string, number, datetime, color, hash formats!

defuse security. home of pie bin, trent, and more...