After I wrote the entry below, about the regional or national scope of various post-abortion ministries, I wanted to say more about Forgiven and Set Free.
That link will take you to the ordering page for the book on Amazon.
As far as I know, there is no author or post-abortion group page devoted to "Forgiven and Set Free". However, the use of programs built around this book is actually very widespread throughout the country. Many crisis pregnancy or pregnancy resource centers use Forgiven and Set Free as the basis for their post-abortion support groups.
There are about 2000 such pregnancy resource centers around the country and these days, it is becoming more common for them to offer post-abortion help. This can mean as little as making a commitment to help women who are post-abortive by assigning a volunteer to go through a Bible study with her one-on-one, as the need arises, to having regularly scheduled groups that go through a post-abortion Bible study (such as "Forgiven and Set Free") with the help of one or more trained facilitators.
However, there is no national group that has the incentive to create a webpage describing the program and what people can expect to get out of it. If there were, and if it included a list of local agencies that offer the program, it would be a long list with national scope.