Etter.filter.hrf is a project mainly written in ..., it's free.
The HRF (HTTP Request/Response Filter) is an ettercap filter that virtually downgrades HTML pathes on-the-fly replacing 'https' strings to 'http' forcing data to be sent over plaintext
HTTP Request/Response (Ettercap) Filter v1.0 by Jan Seidl
This Ettercap (http://ettercap.sourceforge.net/) filter rewrites 'https' strings from requests/responses to 'http', forcing data to be sent over the wire in plaintext.
NOTE: Some websites require SSL connection but the user will still send his data even if the connection never get estabilished. This may be a noisy attack in some services that require the SSL connection.