Yes, applications can be transferred. The app key will stay the same, so you do not need to make any changes to your application.
To transfer an application to a different team:
- Open the application you want to transfer
- Go to the Settings tab
- Change the team where the application belongs
To transfer a team to someone else:
- In the sidebar, click on the Team Settings (cog) icon
- Add the new person to the team, if not there already. If you just added the person to the team, they will need to accept the invitation.
- Change the permissions of the person to Owner.
- Optionally, leave the team by pressing the X icon next to your name.