01CCoding Questions Tracker@CodingQuestionsBotFreeKeeps a study group honest about interview prep: everyone logs the questions they solved and the mock interviews they did, and the bot shows the week's tally. Open source, free.Learning to codeFreeWorks in groupsOpen sourceChecked Sep 1475 / 100ScoreOpen
02Replacebot@RegexpBotFreeRuns a regular expression over text you send and returns the result - a scratchpad for testing a pattern before it goes into code. Free, /help explains the syntax.Learning to codeFreeNo sign-upFor developersChecked Sep 1471 / 100ScoreOpen
03Codeforces@codeforces_botFreeKeeps you on top of Codeforces rounds: when the next contest starts and what is happening on the platform, delivered to the chat. Unofficial fan project, free.Learning to codeFreeNo sign-upFor developersChecked Sep 1467 / 100ScoreOpen
