IKOS (Inference Kernel for Open Static Analyzers) is a static analyzer for C/C++ based on the theory of Abstract Interpretation. IKOS provides a generic and efficient implementation of state-of-the-art Abstract Interpretation data structures and algorithms, such as control-flow graphs, fixpoint iterators, numerical abstract domains, etc. IKOS is independent of a particular programming language. IKOS also provides a C and C++ static analyzer based on LLVM. It implements scalable analyses for detecting and proving the absence of runtime errors in C and C++ programs.