QuadraticModels
Linux/macOS/Windows: 
FreeBSD: 
A package to model linear and quadratic optimization problems using the NLPModels.jl data structures.
The problems represented have the form
optimize c₀ + cᵀ x + ½ xᵀ Q x subject to L ≤ Ax ≤ U and ℓ ≤ x ≤ u,
where the square symmetric matrix Q is zero for linear optimization problems.