Port of GRISBI a GPL accounting manager (http://www.grisbi.org/) under Windows. Depending of the GRISBI version the port should be done using CYGWIN or in a native way. You will found here all stuff needed to install, use and compile GRISBI under Windows
eComm is open source business solution based on .NET framework and C# language. Should be ported to Linux for Ximian's Mono project. From start it runs on Windows 2000, XP, Windows.NET servers with .NET framework and MS SQL Server 2000 on server.