This page in a nutshell: Listed below are various tools and tutorials intended to simplify, make more efficient, or provide additional functionality to Wikipedians.
Alternative browsing, alternatives to accessing Wikipedia through your web browser (mobile devices, desktop integration, alternate portals, etc.)
User scripts, a collection of JavaScript routines that add functionality to Wikipedia pages (e.g., regex search and replace, changing article formatting, and simplifying common tasks)
MW, "VCS-like nonsense for MediaWiki websites" with status, pull, diff, commit, and merge.
WatchlistBot is a bot that delivers realtime alerts via instant message (XMPP) when watched articles are edited or when watched users or IP networks edit.
Navigation shortcuts offer the ability to add personal links to the sidebar, providing quick and easy access to favourite articles within Wikipedia.
Axon, a Firefox search add-on. Double-click a word or select text to open the Wordnik dictionary definition or a Wikipedia article in any language of your choosing.
Cleeki, Cleeki is a Windows-based program for generic search purpose, but particularly optimized for Wikipedia. It allows one click keyword grabs from anywhere on the screen and returns Wikipedia results for them.
Mirrors of Wikimedia content can be filtered from Google search result pages in Firefox using the CustomizeGoogle extension.[1] See meta:Mirror filter for instructions and a filter list.
Wikipedia:Wiki2VCS, script that loads histories onto one's computer, so that they can be quickly diffed and searched
XTools Page History Page statistics and visualization, provides sortable and exportable list of all contributors with number of edits and amount of added text. Provides also results of syntax and grammar checks and latest assessment history.
Diffs
User:Mattflaschen/Compare link.js, makes the "compare selected versions" button into a link (diffs can be in new windows, tabs, etc.)
User:Cacycle/wikEdDiff, user script – additions and deletions are highlighted by color in one continuous text
User:Stevage/EnhanceHistory.user.js, Collapses consecutive edits from the same person into one, integrates (shows) diffs on the history page
Finding the responsible user
WikiBlame, searches for given text in versions of article
User:AmiDaniel/WhodunitQuery, Windows application that identifies the edit and user who added a specific word or phrase
whoCOLOR, browser script for Grease/Tampermonkey, highlights original authors directly in the article, gets data from a publicly accessible API
User edit counts and analysis
userhist, user script, adds interface elements for isolating a user's changes to a page.
Editor Interaction Analyzer compares the edits of two to three specified editors to see which articles overlap, sorted by minimum time between edits by both users. Only works on the English Wikipedia. Speed: slow.
Intersect Contribs, compares the edits of two to eight editors at any WMF wiki to see which articles overlap. Speed: fast.
Intertwined contributions, merges the contributions of two editors at any WMF wiki into a single list. Speed: fast.
Interaction Timeline a chronological history of two users' across pages where they both made edits.
MediaWiki Table Utility or this updated version This class constructs a MediaWiki-format table from an Excel/GoogleDoc copy&paste. It provides a variety of methods to modify the style. It defaults to a Wikipedia styling with first column header.[2]
de:Benutzer:Duesentrieb/csv2wp (en) or CSV Converter: Converts many types of spreadsheet tables, including CSV, tab-separated, etc., to MediaWiki or HTML
csv2other: a free open source tool, in .net, to convert CSV and EXCEL files to wiki table format
Mediawiki CSV Import tool: A proprietary, commercial, tool to create mass Mediawiki pages using CSV datasource and variable based templates. Results merged into a valid Mediawiki XML Import file.
wiki2csv: a commmand line tool that can convert wikitables to CSV and back. Useful to edit wikitables in Excel (or OpenOffice).
OpenOffice/LibreOffice
Sun Wiki Publisher, an OpenOffice extension that allows exporting documents as MediaWiki source text via the File → Export → File Format drop down menu. Since OpenOffice.org can open all Microsoft Office files, one can open files created in Microsoft Word and export them to the MediaWiki format. Compatible with: OpenOffice.org 3.0 | StarOffice 9 or higher. Also available for LibreOffice
HTML
Html2Wiki is an extension for MediaWiki that imports HTML
mw:Alternative parsers, programs and projects to translate MediaWiki's text markup syntax into something else, such as HTML
wikitable2csv is a web tool that extracts wikitables from a given page and converts them to CSV.
wiki2csv is a command line tool that can convert wikitables into comma separated value files that can be edited by Excel or LibreOffice. The result can be converted back retaining most of the original formatting.
mw:Extension:TextExtracts (API function to convert into cleaned up HTML or plain text; without links)
Not English, tools that have not yet been translated completely into English. Some need their descriptions translated from German, others are not available in English. Help translate if you can!
Note: Checkinks is buggy use with caution. Consider using instead Internet Archive Bot which can be found in the History tab of any page: "Fix dead links" – login does not require a password.
WikiBiff, To alert users when they have new messages waiting on their talk pages