The large number of empty repositories can be explained by the fact that in the old days, for each project, repositories were created for CVS and Subversion. No project starts using both and in recent years many projects chose to use Mercurial, Darcs or Git.
If nobody objects, I'll remove the list of directories below on Saturday March 28th.
/project/able/cvsroot
/project/adw-charting/cvsroot
/project/ait/cvsroot
/project/alexandria/cvsroot
/project/ansi-test/cvsroot
/project/araneida/cvsroot
/project/armedbear/cvsroot
/project/armish/cvsroot
/project/arxana/cvsroot
/project/asdf-addons/cvsroot
/project/asdf-binary-locations/cvsroot
/project/asdf-packaging/cvsroot
/project/asdf-system-connections/cvsroot
/project/asia/cvsroot
/project/aspectl/cvsroot
/project/babel/cvsroot
/project/bdb/cvsroot
/project/berkeley-db/cvsroot
/project/bknr/cvsroot
/project/boston-lisp/cvsroot
/project/bpm/cvsroot
/project/buclet/cvsroot
/project/bytemap/cvsroot
/project/c2ffi/cvsroot
/project/caleb/cvsroot
/project/cdr/cvsroot
/project/chemboy/cvsroot
/project/chtml-matcher/cvsroot
/project/cl-amqp/cvsroot
/project/cl-api/cvsroot
/project/clappa/cvsroot
/project/cl-applescript/cvsroot
/project/clarity/cvsroot
/project/claw/cvsroot
/project/cl-bench/cvsroot
/project/cl-berkeley-db/cvsroot
/project/cl-bio/cvsroot
/project/cl-buchberger/cvsroot
/project/clbuild/cvsroot
/project/cl-bzip2/cvsroot
/project/cl-cactus-kev/cvsroot
/project/cl-cairo2/cvsroot
/project/cl-captcha/cvsroot
/project/cl-clickatell/cvsroot
/project/cl-colors/cvsroot
/project/cl-cont/cvsroot
/project/cl-couch/cvsroot
/project/cl-curl/cvsroot
/project/cl-darcs/cvsroot
/project/cl-def/cvsroot
/project/cl-dises/cvsroot
/project/cl-dwim/cvsroot
/project/cl-ec2/cvsroot
/project/cl-emb/cvsroot
/project/cleric/cvsroot
/project/cl-facebook/cvsroot
/project/cl-fuse/cvsroot
/project/clget/cvsroot
/project/cl-glpk/cvsroot
/project/cl-graph/cvsroot
/project/cl-graphviz/cvsroot
/project/cl-gtk2/cvsroot
/project/cl-heap/cvsroot
/project/cl-hooks/cvsroot
/project/cliki/cvsroot
/project/climplayer/cvsroot
/project/cl-irregsexp/cvsroot
/project/cl-json/cvsroot
/project/cl-kanren-trs/cvsroot
/project/clkd/cvsroot
/project/cl-launchpad/cvsroot
/project/cl-lazy-list/cvsroot
/project/cl-lexer/cvsroot
/project/cl-librarian/cvsroot
/project/cl-machine-learning/cvsroot
/project/cl-markdown/cvsroot
/project/cl-match/cvsroot
/project/cl-mathstats/cvsroot
/project/cl-memcached/cvsroot
/project/cl-migrations/cvsroot
/project/cl-monad-macros/cvsroot
/project/cl-mpd/cvsroot
/project/cl-mpi/cvsroot
/project/cl-muproc/cvsroot
/project/cl-ncurses/cvsroot
/project/cl-neo4j/cvsroot
/project/cl-net-snmp/cvsroot
/project/cl-objc/cvsroot
/project/cl-octave/cvsroot
/project/cl-ode/cvsroot
/project/clois-lane/cvsroot
/project/clonsigna/cvsroot
/project/cl-opengl/cvsroot
/project/cl-openid/cvsroot
/project/cl-org-mode/cvsroot
/project/closer/cvsroot
/project/clotnet/cvsroot
/project/cloud/cvsroot
/project/cl-pdf/cvsroot
/project/cl-peg/cvsroot
/project/cl-perec/cvsroot
/project/cl-plus-j/cvsroot
/project/cl-pop/cvsroot
/project/cl-proc/cvsroot
/project/clpython/cvsroot
/project/cl-quasi-quote/cvsroot
/project/cl-rdbms/cvsroot
/project/cl-rundown/cvsroot
/project/cl-serializer/cvsroot
/project/cl-sockets/cvsroot
/project/clsql-fluid/cvsroot
/project/cl-sqlite/cvsroot
/project/clsql-mysql-introspect/cvsroot
/project/cl-stm/cvsroot
/project/cl-stomp/cvsroot
/project/cl-syntax-sugar/cvsroot
/project/cl-taint/cvsroot
/project/cltl3/cvsroot
/project/cl-trane/cvsroot
/project/cl-twitter/cvsroot
/project/cl-typesetting/cvsroot
/project/cl-uri/cvsroot
/project/cl-variates/cvsroot
/project/cl-walker/cvsroot
/project/cl-weblocks/cvsroot
/project/cl-wiki/cvsroot
/project/cl-xml/cvsroot
/project/cl-xmlspam/cvsroot
/project/cl-yacc-ebnf/cvsroot
/project/common-lisp-beginner/cvsroot
/project/common-math/cvsroot
/project/commonqt/cvsroot
/project/computed-class/cvsroot
/project/core-services/cvsroot
/project/css-sexp/cvsroot
/project/decl/cvsroot
/project/defclass-star/cvsroot
/project/defmud/cvsroot
/project/de-setf-amqp/cvsroot
/project/de-setf-graphics/cvsroot
/project/docudown/cvsroot
/project/docutrack/cvsroot
/project/drakma/cvsroot
/project/dynamic-classes/cvsroot
/project/dyslexia/cvsroot
/project/eager-future/cvsroot
/project/ecl-readline/cvsroot
/project/editor-hints/cvsroot
/project/encline/cvsroot
/project/erlang-in-lisp/cvsroot
/project/erlisp/cvsroot
/project/external-program/cvsroot
/project/f2cl/cvsroot
/project/flexi-streams/cvsroot
/project/fret/cvsroot
/project/fset/cvsroot
/project/ftd/cvsroot
/project/fucc/cvsroot
/project/geco/cvsroot
/project/gecol/cvsroot
/project/geohash/cvsroot
/project/gestalt/cvsroot
/project/gnucard/cvsroot
/project/grand-prix/cvsroot
/project/graphic-forms/cvsroot
/project/gzip-stream/cvsroot
/project/ht-ajax/cvsroot
/project/iaxphone/cvsroot
/project/ieee-floats/cvsroot
/project/innen/cvsroot
/project/ip-interfaces/cvsroot
/project/isidorus/cvsroot
/project/israel-lisp/cvsroot
/project/iterate/cvsroot
/project/iterate-clsql/cvsroot
/project/jess-parse/cvsroot
/project/kpax/cvsroot
/project/langutils/cvsroot
/project/liards/cvsroot
/project/lifp/cvsroot
/project/limp/cvsroot
/project/lineal/cvsroot
/project/lispbox/cvsroot
/project/lisplab/cvsroot
/project/lisp-matrix/cvsroot
/project/lisp-on-lines/cvsroot
/project/lisp-res-kit/cvsroot
/project/l-math/cvsroot
/project/local-time/cvsroot
/project/log5/cvsroot
/project/lw-vim-mode/cvsroot
/project/macho/cvsroot
/project/macondoolap/cvsroot
/project/magicffi/cvsroot
/project/mel-base/cvsroot
/project/metacopy/cvsroot
/project/metatilities/cvsroot
/project/metatilities-base/cvsroot
/project/mirror/cvsroot
/project/misrouted/cvsroot
/project/mkcl/cvsroot
/project/modisc/cvsroot
/project/mod-lisp/cvsroot
/project/movies/cvsroot
/project/named-readtables/cvsroot
/project/names-and-paths/cvsroot
/project/new-op/cvsroot
/project/nixies/cvsroot
/project/nrw-xmcl/cvsroot
/project/nxtlisp/cvsroot
/project/objective-cl/cvsroot
/project/okra/cvsroot
/project/openair/cvsroot
/project/parenscript/cvsroot
/project/parse-declarations/cvsroot
/project/patty/cvsroot
/project/pg-introspect/cvsroot
/project/phorplay/cvsroot
/project/plexippus-xpath/cvsroot
/project/ply/cvsroot
/project/portage-overlay/cvsroot
/project/postmodern/cvsroot
/project/pretty-function/cvsroot
/project/protobuf/cvsroot
/project/py-configparser/cvsroot
/project/python-on-lisp/cvsroot
/project/quiz/cvsroot
/project/rcl/cvsroot
/project/rclg/cvsroot
/project/rfc2109/cvsroot
/project/same/cvsroot
/project/sequence-iterators/cvsroot
/project/sexpc/cvsroot
/project/sheeple/cvsroot
/project/sicl/cvsroot
/project/snow/cvsroot
/project/sparklines/cvsroot
/project/sqlisp/cvsroot
/project/ssc/cvsroot
/project/stdutil/cvsroot
/project/steeldump/cvsroot
/project/stefil/cvsroot
/project/suave/cvsroot
/project/submarine/cvsroot
/project/sudoku/cvsroot
/project/tbnl/cvsroot
/project/teepeedee2/cvsroot
/project/the-feebs-war/cvsroot
/project/tinaa/cvsroot
/project/tioga/cvsroot
/project/trivial-features/cvsroot
/project/trivial-garbage/cvsroot
/project/trivial-http/cvsroot
/project/trivial-timeout/cvsroot
/project/trivial-utf-8/cvsroot
/project/ubf/cvsroot
/project/ucs-sort/cvsroot
/project/ucw/cvsroot
/project/ucw-extras/cvsroot
/project/umpa-lumpa/cvsroot
/project/uri-template/cvsroot
/project/vial/cvsroot
/project/vivace-graph/cvsroot
/project/wispylisp/cvsroot
/project/xcvb/cvsroot
/project/xml-psychiatrist/cvsroot
/project/xmls/cvsroot
/project/xuriella/cvsroot