Figures 1-1 to 1-9, 4-7 to 4-9, 8-1, 9-1 to 9-3, 11-1, 15-1, 16-1, 17-2, 19-1, 19-2, 35-1, 35-3, 36-1: Screenshots of Ubuntu © 2020 Canonical Ltd
Figures 4-1 to 4-4: Screenshots of GNOME © The GNOME Project
Figure 4-5: Screenshot of Kubuntu © 2020 Canonical Ltd
Figure 4-6: Screenshot of Xubuntu © 2020 Canonical Ltd
Figure 5-1: Screenshot of Mozilla Firefox ©1998–2020 by individual mozilla.org contributors.
Figure 5-2: Screenshot of Google Chrome ©2020 Google LLC.
Figure 8-2: Screenshot of Warsow © 2020, Chasseur de Bots
Figure 8-3: Screenshot of Scorched 3D © 2020 Scorched3D
Figure 8-4: Screenshot of Frozen Bubble © Guillaume Cottenceau
Figure 8-5: Screenshot of Supertux © Pelya
Figure 8-6: Screenshot of Battle of Wesnoth © 2003–2020 by The Battle for Wesnoth Project
Figure 8-7: Screenshot of Frets on Fire offers flashy graphics and familiar game play © Unreal Voodoo
Figure 8-8: Screenshot of FlightGear features stunning landscapes and technically accurate control panels © Free Software Foundation
Figure 8-9: Screenshot of In Speed Dreams © Speed Dreams
Figure 12-1: Screenshot of Command Prompt © Microsoft 2020
Figures 23-1, 23-2: Screenshots of CUPS © 2020 Apple Inc
Figure 30-1: Screenshot of Oracle VM VirtualBox Manager © 2020 Oracle
Cover image: Widegren/Karlsson/Photodisc/Getty Images
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