The MGWSI module and its associated gateways (eg m_php, m_jsp and m_aspx) can be downloaded totally free of charge. You can use MGWSI for free, and you'll have full, unlimited access to all of its capabilities, without any time limit or expiry. You can install it on as many of your systems as you wish and use it for as many applications and as many users as you wish.
Although MGWSI is provided free of charge, donations to support its ongoing development are always gratefully appreciated. Note: all donations are treated as part of M/Gateway Development Ltd's income.