TAO Translator uses available online translation services to provide translations. Currently supported services: Google Translate (supports translation, language detection, dictionary, and reverse translations for single words); Microsoft Translator, a.k.a. Bing Translator (supports translation only); Yandex.Translate (supports translation and language detection); and Yandex.Dictionaries (supports dictionary with synonyms and reverse translations). More services are possible in the future.
QtWebSockets is a pure Qt implementation of WebSockets, both client and server. It is implemented as a Qt source code module (.pri file) that can easily be embedded into existing Qt projects. It has no dependencies other than Qt. It features text and binary sockets, frame-based and message-based signals, proxy support, and strict Unicode checking.
BookONO eBook Manager is an e-book manager and convertor designed as a compliment to Calibre. It is not a rewrite of Calibre, but instead an alternative product which makes some different design decisions. It uses Calibre to do a lot of the heavy lifting, so despite being an independent application, it is considered complimentary to Calibre.