From NEOS

• BQPD - quadratic (including nonconvex) programming.
• CPLEX - linear, quadratic, and network linear programming.
• FortMP - integer quadratic programming.
• KNITRO - linear programming, unconstrained and constrained nonlinear optimization.
• LINDO - linear, mixed-integer and quadratic programming.
• LOQO - linear programming, unconstrained and constrained nonlinear optimization.
• LSSOL - least squares problems.
• MOSEK - linear programming and convex optimization (including convex quadratic programming).
• OSL - linear, quadratic and mixed-integer programming.
• PORT 3 - minimization, least squares, etc.
• PROC NLP - various nonlinear optimization capabilities.
• SQOPT - large-scale linear and convex quadratic programming.
• SNOPT - large-scale linear, quadratic, and nonlinear programming problems (including nonconvex quadratic programming.
• QL - convex quadratic programming.
• QPOPT - linear and quadratic problems.

Software offering QP Solvers

• AIMMS modeling system
• AMPL modeling language
• GAMS - modeling language
• LINGO - modeling language
• Mosel - modeling language
• MPL - modeling system
• OPL Studio - optimization language