We are very happy to announce that a version of FastRoute4.1 on Rsyn — taking LEF/DEF input and producing ISPD18/19 route guides — is now released as part of the OpenROAD tool chain:  https://github.com/The-OpenROAD-Project/FastRoute4-lefdef . Kudos to Vitor Bandeira, Eder Monteiro and Isadora Oliveira of UFRGS for developing FastRoute4-lefdef.