171. Text
     Text processing software - string splitters, parsers, and so on
172. thread
     Threads are a kind of concurrency
173. time
     Lisp libraries for working with times, dates, formatting, calendars, ..
174. time management
     time management software - the one that helps you to organize your time
175. trivial
     Trivial software is software which serves a purpose with the minimum amount of complexity, possibly at the expense of robustness
176. unification
     Libraries adding unification operations to Common Lisp
177. Units
     Things dealing with time, date, weight, currency, etc
178. Unix
     Pages on CLiki that may help with closer integration of CL and Unix :
179. URI
     Libraries for dealing with URIs
180. Utilities
     Everyone write their own! See also convenience library

CLiki the common lisp wiki