Minimum Relaxation Heuristic, Zero Objective Heuristic 
https://groups.google.com/forum/#!topic/gurobi/acQBNqAl6IQ

Feasibility Pump
http://www.dei.unipd.it/~fisch/papers/feasibility_pump.pdf

RINS
https://www.ibm.com/support/knowledgecenter/SSSA5P_12.7.0/ilog.odms.cplex.help/CPLEX/UsrMan/topics/discr_optim/mip/heuristics/45_rins.html