APR::Base64 (3pm)    - Perl API for APR base64 encoding/decoding functionality
base64 (1)           - base64 encode/decode data and print to standard output
BIO_f_base64 (3ssl)  - base64 BIO filter
Mail::Message::TransferEnc::Base64 (3pm) - encode/decode base64 message bodies
MIME::Base64 (3perl) - Encoding and decoding of base64 strings
MIME::Decoder::Base64 (3pm) - encode/decode a "base64" stream
MIME::Decoder::Gzip64 (3pm) - decode a "base64" gzip stream