LedgerSMB began as a fork of SQL-Ledger. It has, however, diverged rapidly and the future architecture has very little to do with its ancestry.
Forking controversy
The project began when Chris Travers, dissatisfied with the handling of security bugs in SQL-Ledger, partnered with Christopher Murtagh to produce a fix for CVE-2006-4244. strained relations between SQL-Ledger supporters and the members of the nascent LedgerSMB project.
The forking of LedgerSMB is considered by some in the short-lived SQL-Ledger Open Source License, the licence that was used for SQL-Ledger 2.8.0.