Quest Soft Player
Quest Soft Player is a text-based game developing system leaning towards the choice-based interface (there is an option to make a parser game). It includes a cross-platform player and a couple of utilities for game development.
Originally developed by Valery "Byte" Argunov, it has a big and stable Russian community.
The program is cross-platform, working on Windows, PocketBook, Android, Windows CE / Windows Mobile, Linux / Unix, MacOS, Sony PSP, BeOS / Haiku. The player is licensed under GPLv2, some utilities and libraries are LGPLv2.
There is a flavor of QSP named AeroQSP Shell for making Flash games, making QSP playable in a web browser.