FlatBuffers swift can be found in both SPM

.package(url: "https://github.com/mustiikhalil/flatbuffers.git", .branch("swift"))

and Cocoapods

pod 'FlatBuffers', :git => 'https://github.com/mustiikhalil/flatbuffers.git', :branch => 'swift'

To report any error please use the main repository.