GNS3 and EVE-NG are powerful network simulators that run real Cisco software. Their main sites can be found here:
This section contains preconfigured GNS3 and EVE-NG labs that can be downloaded. The Setup Page provides details of the images used, links for the relevant installation instructions and brief guides on how to import the labs.
Unless otherwise stated, each lab has a GNS3 download, an EVE-NG download and a download of configs as text files.