Inkscape. Draw Freely.

User Documentation

Inkscape Book

Tavmjong Bah is writing a book on Inkscape, available here: http://tavmjong.free.fr/INKSCAPE/MANUAL/html/index.php

Manuals

Unix manpage (built daily)
Keys and Mouse Reference for 0.42 (also available in SVG via Help > Keys and Mouse in Inkscape)
Inkscape User Manual is a work in progress written by Kevin Wixson

Tutorials

Several interactive tutorials in SVG are available via Help > Tutorials in Inkscape. Below the same tutorials are linked in HTML (e.g. for printing), though in this form they lose the interactive aspect.

Some more "inofficial" Tutorials can be found at TutorialsAndHelp.

English	German	French	Brazilian
Basic tutorial Advanced tutorial Shapes tutorial Bitmap tracing tutorial Calligraphy tutorial Elements of Design tutorial Tips and tricks Interpolate	Grundlagen Fortgeschrittene Benutzung Formen Kalligrafie Vektorisieren Elemente des Designs Tipps und Tricks Interpolieren-Erweiterung	Basique Avancé Formes Calligraphie Vectorisation Rudiments de design Trucs et astuces Interpoler	Básico Avançado Shapes Caligrafia Vetorização Elementos Dicas e Truques
Italian	Spanish	Nynorsk Norwegian	日本語/Japanese
Base Avanzato Tips and Tricks	Basico Avanzado Formas Caligrafía Elementos Vectorizar Trucos y consejos	Det grunnleggjande	基本上級シェイプカリグラフィ要素トレースヒントやコツ補間
На русском/Russian	slovenščina/Slovenian	slovenčina/Slovak	Vietnamese
Основы Второй уровень Фигуры Каллиграфия Векторизация Основы дизайна Советы и хитрости	Vodnik po osnovah Napredni vodnik Liki Prerisovanje bitnih slik Kaligrafija Elementi oblikovanja Nasveti in triki Interpoliraj	Základy Pokročilé Tvary Kaligrafia Prvky návrhu Tipy a triky	Cơ bản Nâng cao Hình dạng Đồ lại Thư pháp Tips and Tricks Nội suy
简体中文 Simplified Chinese	Chinese (Taïwan)	Basque	Polish
基础高级形状	基本進階形狀書法描繪要素技巧和秘訣	Oinarrizkoa Aurreratua Formak Kaligrafia Bektorizazioa Elementuak Tips and Tricks	Podstawy Zaawansowany Kształty Kaligrafia Wektoryzacja Elementy Porady i sztuczki Interpolacja
Hungarian	Esperanto	Catalan	Dansk
Bevezetés Haladó Alakzatok Művészi toll Vektorizálás Elemek Tippek Interpolálás	Fundamento	Bàsic	Grundlæggende
Dutch
Basis Geavanceerd Vormen