Anim8or users have made two versions of the manual in PDF format. The first is an easy to use copy of the v1.0 manual made by Dug Armstring. Here's the link:

v1.0 PDF manual

The second is an enhanced version made by Mark. It is more detailed than the one I wrote and includes features up through build 1.01.1318.

v1.01.1318 PDF manual

Index

1. Introduction

• What's New in V1.0
  • User Interface
  • Modeling
  • Animation

2. Basics

• Mouse Usage
• Keyboard Shortcuts
• Undo and Redo
• Tool Tips
• Toolbars and Menus
• Common Buttons
• Top Toolbar
• Arc Rotate
• Editing Widgets
• Grid Control
  • Snap-to-Grid
• Material Editor
• Object Libraries
• Visual Quality
  • OpenGL Workspace
  • File Output
• User Attributes
• Saving .jpg, .png and .bmp Files
• Printing
• Auto Save
• Configuration
• User Interface Configuration

3. Object Editor - Basics and Object/Edit Mode

• Object/Edit Tools
• Basic Objects
• Meshes vs. Parameteric Shapes
• Object Materials
• Plug-in Shapes
• Splines
• True Type Fonts
• Filling
• Extrusion
• Lathing
• Modifiers
• Mirror Image
• Smoothing
• Subdivision Objects
• Morph Targets
• Continuously Mirrored Meshes
• Reference Image

4. Object Editor - Object/Point Mode

• Object/Point Operations
• Point Editing
• Edge Editing
• Face Editing
• Applying Multiple Materials
  • A Note On Selecting Faces
  • Adding Points and Edges
• Adding Faces
• Connecting Meshes
• Merging Points
• Point and Line Parameters
• Face Extrusion and Manipulating Tools
  • Bevel
  • Inset
  • Shell
  • Bump
  • Cut Faces
  • Slide
  • Edge Extrude
    
• Topographical Knife
• Face Editing Commands
  • Bridge
  • Flatten
  • Merge Faces
• Misc. Commands

5. Figure Editor

• Figure Basics
• Edit Operations
  • Visibility
• Building a Skeleton
• Flexible Joints
• Adding Body Parts
• Skinning
  • Influence Volumes
    
  • Skinning Weights
    

6. Sequence Editor

• Time Track
• Scrubber Bar
• Sequence Basics
• Edit Operations
• Visibility Options
• Animate Button
• What is a Key?
• Making a Key Pose
  • Using the Trackball
  • Click-dragging on Bones
  • Inverse Kinematics
• Editing Key Frames
• A Circle Has 720 Degrees
• Ghost Views
• Making a Sequence

7. Scene Editor

• Elements of a Scene
• Adding Objects
• Adding Figures
• The Camera
• Lights
• Targets
• Object Properties Dialog
• Light Properties Dialog
  • Advanced Light Properties
  • Shadow Properties of Light
• Shadows
  • Volume Shadows
  • Ray Traced Shadows
• Environment Settings
• The Time Track
• Previewing and Saving Images
• The Alpha Channel
  • Image Compositing
• Rendering an .AVI Movie
• Alternate Renderers

8. Animation

• Animation with Key Frames
• Animating with Inverse Kinematics
  • Inverse Kinematic Walk Cycle
• Animating Figures with Sequences
• Animating with Expresions
  
• Controllers
  • Kinds of Controllers
• Editing Keys
• Editing Expressions
• Graph Editor
• Editing Segments

9. Materials

• Material Editor
• Texture Selector
• Advanced Textures
• Normal Maps
• Environment Maps
• Texture Mode
  

10. Scripts

• Creating a Script
• The Script Directory
• Installing a Script
• Plug-in Scripts
  • Parametric Plug-in Scripts
  • Export Plug-in Scripts
• Running a Modeling Script
• Controller Scripts
• Script Errors
• Writing Scripts
• Data Types
• Variables
• Expressions
• Statements
• User Functions
• User Attributes

11. ART Ray Tracer

• ART Materials
• Class anim8or
• Class glossyreflector
• Class transparent
• Class dielectric
• Light Attributes
• Ambient Occlusion
• Ray Tracing and Anti-Aliasing

A. Keyboard Shortcuts

• Viewpoint
• Top Toolbar
• Object Editor
• Point Editor
• Figure Editor
• Sequence Editor
• Scene Editor