Much of the RISC-V resource was publicized on GitHub. But as git-submodule is used, it's possible that if a small tool module is updated but a larger project which adopts this module will not update this module until some contributor manually update the .gitmodules file. Before that, one has to check if the newer version of the sub-module is compatible with current project. It is at our own risk to update a sub-module without testing out its compatibility.

In an essence of saving time, the following table was intended to figure out the dependencies between this bunch of codes.

Repo	Submodule	Description
rocket-chip	v	Rocket Chip Generator
	rocket	Rocket Microarchitectural Implementation of RISC-V ISA
	chisel
	uncore
	hardfloat	@berkeley-hardfloat
	dramsim2	@DRAMSim2
	riscv-tools	see below
	fpga-zynq	see below
riscv-tools	v	RISC-V Tools (GNU Toolchain, ISA Simulator, Tests)
	riscv-gcc	gcc+newlib and gcc+glibc toolchains
	riscv-llvm	clang compiler*
	riscv-fesvr	RISC-V Frontend Server
	riscv-pk	RISC-V Proxy Kernel
	riscv-isa-sim	RISC-V Functional ISA Simulator spike
	riscv-qemu	QEMU with RISC-V Emulation Support
	riscv-opcodes	RISC-V Opcodes
	riscv-tests	submodule env @riscv-test-env
fpga-zynq+	v	Ready to use prebuild binaries, reference linked to amazon servers.+ fpga-images-zedboard, fpga-images-zybo, fpga-images-zc706.
	Linux-Digilent-Dev	Fork of linux for the Zybo. For use in the Zybo RISC-V Rocket tutorial.
	u-boot-Digilent-Dev	Fork of u-boot for the Zybo. For use in the Zybo RISC-V Rocket tutorial.
riscv-linux
riscv-gnu-toolchain		GNU toolchain for RISC-V, including GCC 4.9.2. Maybe a newer version of riscv-gcc+
riscv-sodor		educational microarchitectures for risc-v isa
chisel
chisel-tutorial		chisel tutorial exercises and answers
chisel-sift		SIFT processing pipeline in Chisel(under development)*
riscv-angel		JavaScript RISC-V ISA Simulator. Boots linux in a web-browser.
misc
homebrew-riscv
riscv-clang
ccbench		Memory System Microbenchmarks
bits		Firebox Benchmarks

The above table tried to explain these bunch of repositories and their functionalities as well as their dependencies.

In consistent with the hierarchy of the above table suggests, three comprehensive tutorials are present in rocket-chip,  riscv-tools and fpga-zynq repositories covering about hardware description, simulation & build toolchain and FPGA verification respectively. One who is interested in this topic is recommended to read these documents thoroughly.