| Name | Lines of code | Maintainability | Test coverage |
| library/rubygems/test_case.rb | 939 | F 6 days | |
| build/libraries/oniguruma/enc/trans/utf8_mac-tbl.rb | 944 | D 2 days | |
| core/marshal.rb | 970 | F 5 days | |
| core/integer.rb | 1,109 | F 2 wks | |
| core/zed.rb | 1,402 | F 1 wk | |
| library/rubygems/specification.rb | 1,649 | F 1 wk | |
| core/array.rb | 1,666 | F 3 wks | |
| configure.rb | 1,749 | F 2 wks | |
| core/string.rb | 2,061 | F 1 mo | |
| core/io.rb | 2,398 | F 3 wks | |
| build/libraries/oniguruma/enc/trans/euckr-tbl.rb | 8,227 | F 3 wks | |
| build/libraries/oniguruma/enc/trans/emoji-exchange-tbl.rb | 8,389 | A 0 mins | |
| build/libraries/oniguruma/enc/trans/cp949-tbl.rb | 8,829 | F 3 wks | |
| build/libraries/oniguruma/enc/trans/big5-uao-tbl.rb | 19,784 | F 2 mos | |
| build/libraries/oniguruma/enc/trans/gbk-tbl.rb | 21,794 | F 2 mos | |
| build/libraries/oniguruma/enc/trans/big5-hkscs-tbl.rb | 36,844 | A 0 mins | |
| build/libraries/oniguruma/enc/trans/gb18030-tbl.rb | 63,362 | A 0 mins |