Manifold Studio enables you to airdrop tokens to any address. Airdrops can be done for both ERC-721 and ERC-1155 contracts.
You can airdrop both on mainnet and Goerli (in case you want to test out the airdrop first).

Airdrop ERC-1155

Let's say you want to create an NFT with 13 editions to Airdrop to 13 of my collectors.
You can simply start creating your NFT and then click on "Mint to Goerli".
Once you click you will get the option to either mint the NFTs to yourself or Airdrop them.
When you click on "Airdrop" you'll get a pop up asking you to insert the different wallets to airdrop to and how many NFTs each wallet should get.
If you want to insert a batch of wallets you can upload a CSV with all the addresses and tokens. If all wallets are just getting one token, you can upload a CSV file simply with the addresses. The CSV should have the addresses as the first column and the quantity as optional second column. You don't need to add any headers to the CSV file. Repeated addresses are allowed and Manifold Studio will simply add them up (e.g if an address shows up twice in the CSV file, that address will get 2 tokens).
Once you have your list ready you can just go ahead and click "Mint" to mint and airdrop all those editions to your collectors!

Bootstrapping DAOs

Artist collectives have been leveraging our ERC-1155 contract to bootstrap DAOs and airdrop NFTs to every member of the DAO. Check out the examples from EWB and sidewaysDAO.

Airdropping additional 1155 Tokens

View your contract on Etherscan
Click on the Contract tab
You can navigate to the Write as Proxy section of the page. At this point you willhave to connect your Metamask to Etherscan.
Click the [Connect to Web3] button to do so. You can see it in the graphic below with the red dot.
Once connected, click #5 - MintBaseExisting and fill out the fields:
To - The address you would like to send the airdrop to
TokenIDs - The token ID of the NFT
Amounts - The number of copies they will receive, in this case ** Small reminder that the 3 fields need to have the [] brackets to open and close the value. So it would look like [1]