I know people usually want to obtain Packet Tracer but since you have had to have a Cisco Netacad login to do so, and you could only obtain a login by signing up for a Netacad course through an authorized provider, people resorted to downloading elsewhere on the internets. Well today I saw a tweet from Cisco Netacad with a link to sign up for a free course on how to use Packet Tracer, and with that you must create a Netacad account to do so. So follow the link below and under "Download Packet Tracer and Learn" you can click the "Sign Up" button and create a Netacad account and have access to Packet Tracer, and other free courses.
https://www.netacad.com/about-networking-academy/packet-tracer/?utm_source=social&utm_medium=tw&utm_campaign=PT101&utm_content=job
I now have a Netacad login and can access all of the Cisco Netacad resources. Enjoy!