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There exist a variety of “third-party” addons and tools to assist you in creating and extending Twine stories. This is by no means an exhaustive list! More tools are being created all the time, so please add them as they appear.
TwinEdit Description: “An editor to make organising your Twine Projects easier and some smaller additional features.” Author: brutalexcess Platform: Windows Download: https://github.com/brutalexcess/TwinEdit
Twine 1 compiled HTML to Twine 2 archive converter Author: TheMadExile Description: “This application loads a Twine 1 compiled HTML file and converts the relevant data sections into a Twine 2 story archive, which can then be imported into Twine 2.” Platform: Web Download: http://twinery.org/forum/index.php/topic,2279.msg6730.html#msg6730
Twine 2 Harlowe Notepad++ Syntax Highlighter Description: “[It] supports a bit more syntax highlighting. Not everything, and focused on the scripting side instead of the string formatting side.” Author: Noctifier Platform: Windows/Notepad++ Download: http://twinery.org/forum/index.php/topic,2571.msg8154.html#msg8154
SugarCube Notepad++ Syntax Highlighter Description: “It's pretty simple, focused on distinguishing text from code to make writing easier. Also has additional formatting features for different tags like bold to allow you to more easily spot them in the text.” Author: Claretta Platform: Windows/Notepad++ Download: http://twinery.org/forum/index.php/topic,2670.msg8673.html#msg8673
Sublime Twee Description: “twee source code syntax highlighting for Sublime Text 2.” Author: Monospaced Ltd. Platform: Windows/Mac/Linux (Requires Sublime Text) Download: https://github.com/monospaced/sublime-twee