+FS is the temporary prefix for many disparate modules written for the Freeside
+ISP billing software. This includes:
+
+=head2 Database metadata classes
+
+=over 4
+
+=item L<FS::dbdef|FS::dbdef> - Database class
+
+=item L<FS::dbdef_table|FS::dbdef_table> - Database table class
+
+=item L<FS::dbdef_column|FS::dbdef_column> - Database column class
+
+=item L<FS::dbdef_colgroup|FS::dbdef_colgroup> - Database column group class
+
+=item L<FS::dbdef_index|FS::dbdef_index> - Database index class
+
+=item L<FS::dbdef_unique|FS::dbdef_unique> - Database unique index class
+
+=back
+
+=head2 Utility classes
+
+=over 4
+
+=item L<FS::SSH|FS::SSH> - Simple wrappers around ssh and scp commands.
+
+=item L<FS::Conf|FS::Conf> - Freeside configuration values
+
+=item L<FS::UID|FS::UID> - User class (not yet OO)
+
+=item L<FS::CGI|FS::CGI> - Non OO-subroutines for the web interface. This is
+depriciated. Future development will be focused on the FS::UI user-interface
+classes (see below).
+
+=back
+
+=head2 Database record classes
+
+=over 4
+
+=item L<FS::Record|FS::Record> - Database record base class
+
+=item L<FS::svc_acct_pop|FS::svc_acct_pop> - POP (Point of Presence, not Post
+Office Protocol) class
+
+=item L<FS::part_referral|FS::part_referral> - Referral class
+
+=item L<FS::cust_main_county|FS::cust_main_county> - Locale (tax rate) class
+
+=item L<FS::svc_Common|FS::svc_Common> - Service base class
+
+=item L<FS::svc_acct|FS::svc_acct> - Account (shell, RADIUS, POP3) class
+
+=item L<FS::svc_domain|FS::svc_domain> - Domain class
+
+=item L<FS::svc_acct_sm|FS::svc_acct_sm> - Vitual mail alias class
+
+=item L<FS::part_svc|FS::part_svc> - Service definition class
+
+=item L<FS::part_pkg|FS::part_pkg> - Package (billing item) definition class
+
+=item L<FS::pkg_svc|FS::pkg_svc> - Class linking package (billing item)
+definitions (see L<FS::part_pkg>) with service definitions
+(see L<FS::part_svc>)
+
+=item L<FS::agent|FS::agent> - Agent (reseller) class
+
+=item L<FS::agent_type|FS::agent_type> - Agent type class
+
+=item L<FS::type_pkgs|FS::type_pkgs> - Class linking agent types (see
+L<FS::agent_type>) with package (billing item) definitions
+(see L<FS::part_pkg>)
+
+=item L<FS::cust_svc|FS::cust_svc> - Service class
+
+=item L<FS::cust_pkg|FS::cust_pkg> - Package (billing item) class
+
+=item L<FS::cust_main|FS::cust_main> - Customer class
+
+=item L<FS::cust_main_invoice|FS::cust_main_invoice> - Invoice destination
+class
+
+=item L<FS::cust_bill|FS::cust_bill> - Invoice class
+
+=item L<FS::cust_bill_pkg|FS::cust_bill_pkg> - Invoice line item class
+
+=item L<FS::cust_pay|FS::cust_pay> - Payment class
+
+=item L<FS::cust_credit|FS::cust_credit> - Credit class
+
+=item L<FS::cust_refund|FS::cust_refund> - Refund class
+
+=item L<FS::cust_pay_batch|FS::cust_pay_batch> - Credit card transaction queue
+class
+
+=back
+
+=head2 User Interface classes (under development; not yet usable)
+
+=over 4
+
+=item L<FS::UI::Base|FS::UI::Base> - User-interface base class
+
+=item L<FS::UI::Gtk|FS::UI::Gtk> - Gtk user-interface class
+
+=item L<FS::UI::CGI|FS::UI::CGI> - CGI (HTML) user-interface class
+
+=item L<FS::UI::agent|FS::UI::agent> - agent table user-interface class
+
+=back
+
+To quote perl(1), "If you're intending to read these straight through for the
+first time, the suggested order will tend to reduce the number of forward
+references."