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ACME Laboratories

Purveyors of fine freeware since 1972 — Unix tools, web servers, maps, and developer utilities, all free.

ACME Laboratories (acme.com) is the personal software laboratory of Jef Poskanzer, offering a wide collection of free, open-source Unix software, web server implementations, mapping tools, and JavaScript utilities. The site has been active on the internet since 1991 and distributes tools ranging from lightweight HTTP servers (thttpd, mini_httpd, micro_httpd) to image format converters (pbmplus), text editors (emin), mail filter modules (spfmilter), and interactive map applications. All software is provided at no cost under the ACME Labs Freeware License. The project is a one-person operation run by a veteran Unix and C developer based in Berkeley, California.

Visit ACME Laboratories →acme.com· Listed Sep 7, 2026

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Product analysis AI · from acme.com

Problem it solves

Developers and sysadmins need small, fast, reliable Unix tools and web servers without the overhead and complexity of large commercial or bloated open-source alternatives.

Why people use it

ACME Labs provides battle-tested, minimal-footprint Unix software — including web servers, mail filters, image converters, and developer utilities — all freely available with source code, maintained by an expert Unix developer since 1972.

Built for

Unix/Linux developers and system administrators seeking lightweight, free tools

Also: Web developers needing small embeddable HTTP servers, Hobbyist programmers and open-source enthusiasts, Network and mail server administrators, Geospatial and mapping hobbyists

What makes it different

  • Extreme minimalism: tools like micro_httpd implement full HTTP in ~200 lines of code
  • Long-standing provenance: active since 1972/1991 with a trusted, consistent author (Jef Poskanzer)
  • thttpd was historically cited as the fifth most popular web server on the internet and benchmarked as fastest in third-party tests
  • Broad, cohesive freeware library spanning HTTP servers, mail filters, image formats, maps, and JS widgets — all from one author
  • No commercial motive: purely free software with no subscription, paywall, or vendor lock-in

Business model

other

Works with

Google Maps API v3Leaflet.jssendmail milter APIlibspf / libspf2libtiff / libjpeg / libpng

Alternatives

Apache HTTP ServernginxNetpbmGNU Emacs / Micro EmacsLeaflet.jsApache HTTP ServernginxlighttpdNetpbmGNU EmacsPostfix milter ecosystem

Industries

developer-toolsopen-source-softwareweb-infrastructuregeospatial
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