If your company releases a closed source library for iOS or OS X, you can still create a Podspec for them using the standard Podspec DSL.
Bundles are handled like any other resource:
s.resource = 'BundleName.bundle'
s.frameworks = 'FrameworkName'
s.xcconfig = { 'FRAMEWORK_SEARCH_PATHS' => '"$(PODS_ROOT)/FrameworkName"' }
s.preserve_paths = 'FrameworkName.framework'
s.source_files = 'FrameworkName.framework/Headers/*.{h}'
s.library = 'LibraryName'
s.xcconfig = { 'LIBRARY_SEARCH_PATHS' => '$(PODS_ROOT)/LibraryName' }
s.preserve_paths = 'LibraryName.a'