FAQ: updated 1.10 How many are using curl?

  We don't know how many users that downloaded or installed curl and then

  never use it.

  Some facts to use as input to the math:

  curl packages are downloaded from the curl.haxx.se and mirrors over a

  million times per year. curl is installed by default with most Linux

  distributions. curl is installed by default with Mac OS X. curl and libcurl

  as used by numerous applications that include libcurl binaries in their

  distribution packages (like Adobe Acrobat Reader and Google Earth).

  More than a hundred known named companies use curl in commercial

  environments and products and more than a hundred known named open source

  projects depend on (lib)curl.

  In a poll on the curl web site mid-2005, more than 50% of the 300+ answers

  estimated a user base of one million users or more.

  In March 2005, the "Linux Counter project" estimated a total Linux user base

  of some 29 millions, while Netcraft detected some 4 million "active" Linux

  based web servers. A guess is that a fair amount of these Linux

  installations have curl installed.

  The Debian project maintains statistics on packages installed by people

  who have voluntarily run their package counting application.  In mid-2010,

  libcurl3 was installed on over 55000 such systems (62% of reporting systems)

  and was one of the 320 most popular installed packages (out of about 107000

  possible packages).

  All this taken together, there is no doubt that there are millions of

  (lib)curl users.

  http://curl.haxx.se/docs/companies.html

  http://curl.haxx.se/docs/programs.html

  http://curl.haxx.se/libcurl/using/apps.html

  http://counter.li.org/estimates.php

  http://news.netcraft.com/archives/2005/03/14/fedora_makes_rapid_progress.html

  http://qa.debian.org/popcon.php?package=curl

  In May 2012 Daniel did a counting game and came up with a number that may

  be completely wrong or somewhat accurate. 300 million!

  See http://daniel.haxx.se/blog/2012/05/16/300m-users/

  1.11 Why don't you update ca-bundle.crt