Сербский плюс free is an Android-based app developed by Oleg Kuznetsov, aimed at helping users learn Serbian language. With a range of exercises and tests, the app offers an interactive learning experience for beginners and those with prior knowledge of the language. The app consists of eight different sections, including "Learn Words," "Write Words," "Phrase Composition," "Listening," "Dictation," "Pronunciation," "Tests," and "Games." Each section is designed to cater to different aspects of language learning, such as vocabulary, syntax, grammar, and pronunciation. The app also allows users to create their own dictionaries and tests, or download additional dictionaries from the developer's website. However, the app's pronunciation feature uses a Text-To-Speech (TTS) synthesizer, which may not accurately represent the Serbian language due to the lack of Google's support for it. Despite this limitation, Сербский плюс free is a useful tool for those looking to improve their Serbian language skills.