GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
Veeqo - Beautiful online inventory and order management software that integrates with Amazon, eBay, Magento, Shopify & WooCommerce to sync inventory and print shipping labels
HomeBank - Access Financial Services. Easy, fee-free banking for entrepreneurs Get the financial tools and insights to start, build, and grow your business.
Zoho Inventory - Zoho Inventory is an online inventory management software ideal for small businesses. Simplify your inventory and order operations. Try for FREE!
Money Manager Ex - Money Manager Ex is a free, open-source, cross-platform, easy-to-use personal finance software.
Simple-Inventory - Simple Inventory simplifies managing your warehouse or your drop-shipping inventory.