gifsicle is available on el6, but would be grateful for epel7 branch.
Package Change Request
Package Name: gifsicle
New Branches: epel7
Git done (by process-git-requests).
gifsicle-1.87-1.el7 has been submitted as an update for Fedora EPEL 7.
gifsicle-1.87-1.el7 has been pushed to the Fedora EPEL 7 testing repository.
gifsicle-1.87-1.el7 has been pushed to the Fedora EPEL 7 stable repository.