We've been extremely happy with SQL Ledger - http://www.sql-ledger.com/ http://www.sql-ledger.com/ It's open-source and it's PostgreSQL-backed, so it's easy to

We've been extremely happy with SQL Ledger - http://www.sql-ledger.com/ http://www.sql-ledger.com/ It's open-source and it's PostgreSQL-backed, so it's easy to automate various bookkeeping phenomena by attaching triggers to SQL Ledger table changes that propagate elsewhere, or vice versa. Its interface is very web 1.0-ish, and in virtue of that, very fast and responsive. It's definitely rather low-level in the sense that it's easy to shoot yourself in the foot with it. It's like programming in C instead of C# or Java. It requires understanding double-entry accounting and GAAP at a fairly erudite fundamental level, because unlike QuickBooks, there are no glossy splash screens or inline thought balloons to teach you Accounting 101. It's also lacking in many high-level features such as a payroll module, and has fairly rudimentary stubs for many others. It is, however, quite good at managing parts, assembles and inventory if tangible goods are your thing. It's a little more problematic for a service company; outside of AR and AP, I tend to think of it as little more than just a general ledger. That may not be giving it enough credit, though; it does have quite a lot of features. Nevertheless, it is a great tool for a startup comfortable with using home-grown open-source solutions.