| python312Packages.coloredlogs | Colored stream handler for Python's logging module |
| haskellPackages.happlets | "Haskell Applets" provides an event handler and a canvas for building simple GUI apps |
| python313Packages.mkdocstrings-python | Python handler for mkdocstrings |
| python314Packages.mkdocstrings-python | Python handler for mkdocstrings |
| perlPackages.HTMLMasonPSGIHandler | PSGI handler for HTML::Mason |
| perl5Packages.HTMLMasonPSGIHandler | PSGI handler for HTML::Mason |
| haskellPackages.classy-effects | An interface for a handler-independent, typeclass-based effect system |
| texlivePackages.kvsetkeys | Key value parser with default handler support |
| python312Packages.mkdocstrings-python | Python handler for mkdocstrings |
| haskellPackages.classy-effects-base | An interface for a handler-independent, typeclass-based effect system |
| perl538Packages.HTMLMasonPSGIHandler | PSGI handler for HTML::Mason |
| perl540Packages.HTMLMasonPSGIHandler | PSGI handler for HTML::Mason |
| texlivePackages.blopentype | A basic LuaTeX OpenType handler |
| haskellPackages.hack-frontend-monadcgi | Allows programs written against MonadCGI to run with any hack handler. (deprecated) |
| haskellPackages.mailchimp-subscribe | MailChimp subscription request handler |