- CL-MIME - CL-MIME is a library for constructing and manipulating MIME objects in Common Lisp
- cl-qprint - CL-QPrint is a library for encoding to and decoding from strings in quoted-printable (MIME) data format
- CL-RFC2047 - CL-RFC2047 is an ASDF installable package by Christian Haselbach that provides an encoding and decoding text according to RFC 2047 (MIME)
- jarw-inet - jarw-inet supports several Internet networking Standards including writing servers and clients, http, smtp, nntp protocols, header parsing, mime decoding
- MIME4CL - MIME4CL allows you to craft MIME compliant messages or to parse and handle them programmatically
MIME
MIME, Multipurpose
Internet Mail Extensions, provides extensions to plain text Internet Mail messages defined in RFC 822 to provide for a wider range of content types. MIME is also used for multipart/form-data posts in HTML