Balabolka Portable is a text-to-speech software that can read aloud any text in a natural-sounding voice. It supports various file formats including DOC, EPUB, PDF, and HTML. The software allows users to customize the speech rate, voice, and volume, and can also save the audio output as a WAV, MP3, or OGG file. Additionally, Balabolka Portable can highlight words as they are being read and supports multiple languages.