PortableApps--carry everything you need to write on a USB
http://portableapps.com/

Dictionary: http://portableapps.com/apps/education/goldendict_portable
Procrastination: http://portableapps.com/apps/games
Internet tools: http://portableapps.com/apps/internet

Create a book cover with
Gimp: http://portableapps.com/apps/graphics_pictures/gimp_portable
& InkScape: http://portableapps.com/apps/graphics_pictures/inkscape_portable

Create an audiobook: http://portableapps.com/apps/music_video/audacity_portable

Word Processors:
Open Office: http://portableapps.com/apps/office/openoffice_portable
Libre Office: http://portableapps.com/apps/office/libreoffice_portable
Focus Writer: http://portableapps.com/apps/office/focuswriter_portable

Remember to take breaks: http://portableapps.com/apps/utilities/workrave_portable

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yWriter: http://www.spacejock.com/yWriter5.html