Ranked in these QuestionsQuestion Ranking
Pro Free and open source
Kiwi IRC web client is available for free licensed under GPL with source available on GitHub.
Pro Beautiful interface
Kiwi's default interface is aesthetically modern, while keeping a classic two-column layout with chat window on the left and nicklist on the right. Unlike many other interfaces, a considerable amount of effort has been spent on making it easy on the eyes.
The interface offers common customization options including time format changes, choice of system messages and choice of laying out channels in a tabbed or list manner.
Code can be generated that allows embedding the IRC client within a website.
Pro Available in multiple languages
Kiwi's front-end is available in more than 20 languages including Polish, Romanian and Russian.
Con Notifications don't time out
Notifications pop-ups have to be closed manually each time, they don't disappear on their own after a set amount of time.