GENESIS 3 (G-3) is intended to be a modular 21st century neural simulator with greater interoperabily than older generation simulators such as GENESIS 2 and NEURON
G-3 is still in development stage, and development has slowed down due to lack of funding.
Meanwhile, the classic GENESIS 2 simulator continues to be maintained, with user contributions added through the Repository for the continued development of the GENESIS 2.4 neural simulator at https://github.com/genesis -sim/genesis-2.4. and the GENESIS 2 Home Page.
Information about Parallel GENESIS (PGENESIS) can be found here.
Here are some links to documentation for G-3:
GENESIS Home Page