Are there secular alternatives to Al-Anon?
HARM LESS is an alternative to Al-Anon for people who wish to reduce the harm caused by a loved one’s drinking. HARM LESS utilizes the principles of Harm Reduction, Motivational Interviewing, and Cognitive Behavioral Techniques to help you to cope and to encourage your loved one to change. For more information please visit Al-Anon Alternatives – HARM LESS.
http://hamsnetwork.org/harm-less/
As mentioned above, SMART Recovery is secular peer support recovery organization. They have recently added expanded support for "Family and Friends" and offer an online meeting.
Meetings incorporate CRAFT principles and SMART tools. This might be what you’re looking for if searching to an option other than Al-Anon: http://www.smartrecovery.org/resources/family.htm
Just a word of caution, if you do manage to find a secular alternative: it may be wholly different demographic than you’d see in a pure AA setting. I went to one meeting at a Unitarian church in Utica, some years ago, which advertised itself as a secular addiction recovery group. Most of the folks there (while perfectly lovely individuals of their own rite) were recovering from heroin or crack addiction. There was also no concept of a 12-step program, and was more group-therapy oriented than I was expecting. They have the potential to be a horse of a slightly different color than an AA group, I think, and might not be as applicable to your partner.