The Windows SDK
The QSI SDK provides both a C API (QSICameraClib.dll) and a COM API (QSICamera.dll) on Windows.
The C API exposes a traditional C layer that can be integrated with almost any programming language.
The COM layer provides integration with various Microsoft languages including VBA, .NET and VC++. It also provides integration with scientific programs that adhere to the COM standard LabVIEW, MATLAB etc. The COM layer also exposes an ASCOM layer for Astronomy development.
Download the QSI Windows SDK
The Linux SDK
QSI provides a camera control C++ API for Linux users.
The API requires Linux kernel version 2.6 or later configured with libusb.