Free and open source text editor which works as an alternative to Notepad. Extremely powerful and extensive it is for Windows only and runs under the GPL License.
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Pro Syntax highlighting for a wide variety of languages
Notepad++ has built in support for syntax highlight for a wide selection of programming languages.
Pro Light and fast
Notepad++ is a very light program that starts almost instantly. Making for a great text editor for users that want something that will start the second the open it.
Pro Free under GPL
Notepad++ is licensed under GPL, which means it is free/open source software you can use freely.
Pro Multi-line editing
While it is disabled by default, when enabled, it is possible to edit more than one line at a time. Helpful in many situations.
Pro Extendable via plugins
You can get a portable version of N++ and put it on a flash drive or your dropbox account and have your editor, configured the way you like, at any computer that you are on.
Pro Regex replace in selection, active tab, or all tabs
Use regular expressions to quickly modify text across multiple files.
Pro Split screen
Open and edit files in multiple screens within the editor window.
Con Outdated UI
Only the text area can be themed, and it doesn't have as many features as browser-based text areas.
Con Limited new syntax support for new languages
It may be hard to find good plugins for relatively new languages.
Con Annoying update notifications upon start
Update notifications tend to pop up and annoy upon start after having not used the app or machine for a few days.
They are at least easily turned off.
Con User defined language doesn't support triple quote strings
Nor triple hashed comments. Both styles are overridden by their single character single line version.
Con Session backups not enabled by default
Unsaved tabs will be lost when Npp crashes unless you first enable the session backup option.