Yes but I could not find any software on the steem.io website.
I think there is a Github repo, have to look at it.
Although I am sure there isn't a specific LInux wallet out there , as lightweight SPV wallet like Electrum/EC, so the only way to access money is from Steemit or Busy i think.
There is a Desktop Wallet developed by @jesta named Vessel. With that, you can manage your account keys and keep them offline but even if you don't trust the online or desktop wallet there is still the possibility for a paper wallet.
https://steemit.com/vessel/@jesta/vessel-0-2-0-interact-with-steem-securely-from-any-website