ABySS: genome sequence assembler for short reads
http://www.bcgsc.ca/platform/bioinfo/software/abyss Formula was removed
Last versions were

Reverse dependencies

The following formulae require abyss to be installed:
rampart 0.12.2 Configurable de novo assembly pipeline
cerulean 0.1 Extend contigs assembled using short reads using long reads

Recent formula history

Jonathan Chang abyss: migrate to homebrew-core (#6332)
Shaun Jackman abyss 2.0.2
ilovezfs Revert "Use Ruby 1.9+ symbol hash keys in all formulae." (#4345)
JCount Use Ruby 1.9+ symbol hash keys in all formulae. (#4339)
ilovezfs abyss 2.0.1

Formula code at GitHub