The title actually explains my question. When I google this question I only see ERC-721 and ERC-1155. Are there any other NFT standards?
Those are by far the most common NFT standards, but there are others. However, they are almost exclusively based on EIP-721 and EIP-1155 (better to have only one standard). Here's a list I found by searching the EIP respository:
https://github.com/ethereum/EIPs/blob/65b55a30bbba2640c9a9638d287929de979a4623/EIPS/eip-4907.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-4799.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-4393.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-4885.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-2981.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-3569.md https://github.com/ethereum/EIPs/blob/86a7b57c534c10ebcdab2ef3f62a4befed2ab46d/EIPS/eip-5007.md https://github.com/ethereum/EIPs/blob/e349cc23473cc40a95bb5ea240fae8db98019514/EIPS/eip-5008.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-4955.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-3440.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-4944.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-2615.md https://github.com/ethereum/EIPs/blob/048c5c91ff0e23ea22c2b4207eae6c6273d9183f/EIPS/eip-4519.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-4494.md https://github.com/ethereum/EIPs/blob/a9d1ef9bd0a959bfd06da60ee4fb63f1bfa727c4/EIPS/eip-4906.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-4341.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-1948.md https://github.com/ethereum/EIPs/blob/9e393a79d9937f579acbdcb234a67869259d5a96/EIPS/eip-4521.md