I developed the first bot, which can be used as a sample, with JavaScript (ES6, and ES7's async/await) and Nightmare (based on Electron, so on Chromium).
It's awesome because free API access to this data for any bank in the world may enable new and interesting fintech apps (actually, for me this project is a stepping stone towards another project that I plan to build on top of it), and I think that the open-source approach is the most effective way to achieve that (i.e. free and comprehensive API access to accounts data on any bank of the world).