It's not an exact alternative but I'm using Google Spreadsheets with Python and SQLite. It's webapp, it's in the cloud and always synced among the team. There are some API performance issues since you're working with a remote server but it's OK for me.
Some API wrappers I've used: a slightly outdated official wrapper gdata-python-client [1] and a bit more convenient gspread [2].
Some API wrappers I've used: a slightly outdated official wrapper gdata-python-client [1] and a bit more convenient gspread [2].
[1]: https://code.google.com/p/gdata-python-client/
[2]: https://github.com/burnash/gspread/