Please note, RISC-V ISA and related specifications are developed, ratified and maintained by RISC-V Foundation contributing members within the RISC-V Foundation Technical Committee. Operating details of the Technical Committee can be found in the RISC-V Foundation Tech Group. Work on the specification is performed on GitHub and the GitHub issue mechanism can be used to provide input into the specification.
The specifications shown below is the current ratified release. The most recent version of the draft specification, which is in development within the Technical Committee, can be found here on GitHub.