Several open-source and educational projects provide full source code for review or customization:
: This is a more comprehensive toolset written in VB.NET. It integrates Accounting, POS, and Inventory management and is designed to be compatible with SQL Server. Accounting Software With Source Code Visual Basic
: Designed specifically to mimic manual accounting , making it highly useful for students and lecturers to check homework or understand double-entry basics. Accounting Software With Source Code Visual Basic
: A VBA-based General Ledger system that provides basic financial reporting for small businesses, such as legal or web design firms. Critical Considerations for VB Source Code Accounting Software With Source Code Visual Basic
Cynics Accounting VB.NET Source Code - Download - UpdateStar