*** .externalToolBuilders/
This directory stores project-specific launch configurations for external tool builders, such as ant tasks that have to be executed to fulfill the build lifecycle

*** *.launch
It is possible to store "eclipse launch configurations" in external files. These (XML-)files may be stored anywhere within your projects and will be discovered by Eclipse automagically.

The .gitignore rule "Icon?" will also match directories such as
"icons/", at least on a case-insensitive file-system (this happened to
me on OS X 10.7). I only noticed this several days later because a
developer was complaining about missing icons in his repository. I don't
really know what type of files this rule is supposed to match, but I
guess the described behavior is not expected.

This reverts commit 8e27618144.

be absolute because there may be some files with the same names
deeper in the path structure.

According to this (http://netbeans.org/kb/docs/java/import-eclipse.html#versioning) knowledge base article, the nbproject folder should be checked into the VCS in order to allow people to open the project without importing.

This is a transient file generated by the Scala-IDE Eclipse plugin, which is regenerated on a clean build, and should not be checked into VCS.

Add:
 * General nanoc gitignore file

It is possible to run the project converter multiple times, which would generate new backup-directories (Backup1-Backupn) and logfiles (UpgradeLog2.XML-UpgradeLogn.XML)

gitignore files.

The behavior is documented in [1].
The prefix doesn't seem to be documented, but it is hardoced as described in [2].

[1]: http://www.gnu.org/software/emacs/manual/html_node/emacs/Interlocking.html#Interlocking
[2]: http://tekman.livejournal.com/79598.html

Environment support eliminates the need to ignore database.php.  Instead, ignore the entire development dir.
Logs and cache are now in application folder instead of system.

Ruby.gitignore

PlayFramework: Ignoring `precompiled` directory

Ignore Netbeans run configuration file

Global/Archives.gitignore

More VisualStudio rules

added .build to Perl.gitignore