  To aid contributions to the Snowmass 2021 US Community Study on physics at
the International Linear Collider and other proposed $e^+e^-$ colliders, we
present a list of study questions that could be the basis of useful Snowmass
projects. We accompany this with links to references and resources on $e^+e^-$
physics, and a description of a new software framework that we are preparing
for $e^+e^-$ studies at Snowmass.
