SCIP provides a range of different interfaces to LP solvers:

LPI name	LP solver
spx	SoPlex
cpx	IBM ILOG CPLEX
xprs	FICO XPress
grb	Gurobi (version at least 7.0.2 required)
clp	COIN-OR CLP (interface currently sometimes produces wrong results)
glop	Google Glop (contained in OR-tools)
msk	Mosek (version at least 7.0.0 required)
qsopt	QSopt (experimental)
highs	HiGHS (beta, sometimes failing)
none	disables LP solving entirely (not recommended; only for technical reasons)