I have a bunch of code on GitHub. Some items in particular:
I regularly pull data from Route Views for use in my research. The naming schemes between collectors differs in places, and the BGP data arrives in different formats. The data in its raw form is not so especially useful. I use these scripts to pull down current Route Views data and mash it together into more immediately useful forms.
The grubbiest part of the collection is the AWK script to cleanse the Cisco-format BGP data. This is grubby because the output from the Cisco routers is intended to be human readable, and its format has changed over time. The AWK script takes the Cisco output, and produces much cleaner prefixes with associated paths.
The overlay for real-time applications. A stand-alone peer-to-peer library written in C, and designed primarily for use with the Robust Audio Tool, a work of the UCL Network and Multimedia Research Group.
Command line Flickr image uploader. Written in idle time over a couple of weekends as a tool I could run as part of a regular cron task.
Some bits of C; longest-prefix matching, IP matcher, that sort of thing. No complete projects.
Some example Scala code, including an efficient implementation of Dijkstra's shortest-paths algorithm, an object interning class, and example Scala RemoteActor code.