i've just installed lazylist on ctan, in macros/latex/contrib/lazylist
this package, formerly known as lambda (by Alan Jeffrey), has been renamed, with the author's agreement, to avoid conflict with the upstart omega lambda (which is believed to have a greater momentum).
the package does lists in tex's mouth, and provides a bunch of lambda-calculus and list handling macros.
the licence is lppl (again changed with alan's permission).
Robin Fairbairns
For the CTAN team