Figure Credits

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