Crit-bit trees

A simplified version of the PATRICIA trie; allows the operations of a hash plus lexicographic lookup, with potentially better efficiency (although I guess you need to be careful about locality).

to associative data-structures djb hash tree ... on 17 December 2016

Things that use Ed25519

An interesting list. (Of course, the analogous "things that use RSA/AES" would be much longer...)

to crypto djb ed25519 ... on 21 June 2016

MinimaLT

This appears to be the successor of CurveCP, related to the Ethos OS project.

to crypto djb networking protocols tcp ... on 26 March 2014

jedisct1/libsodium ยท GitHub

An autoconf-ised version of the NaCl cryptography library. Looks worth playing with!

to api autoconf crypto djb nacl network security software ... on 17 January 2014

Introduction to DNSCurve

DNS with NaCl cryptography. Encoding the public key in the nameserver's name is a cute trick (and works because the underlying algorithms allow secure short keys). Of course, this has absolutely no chance of being implemented by anyone :(

to crypto djb dns nacl software ... on 24 October 2013

NaCl

Cryptography library with an author list including djb. This has a very elegant API that's designed to be easy to incorporate into other programs -- functions are (essentially) atomic and non-allocating.

to api crypto djb nacl network security software ... on 24 October 2013