Here are some links to tools I use in my creative endeavors. Except where noted most of them are open source and don’t cost anything.
Illustration, Photo, DTP, and Painting
Inkscape: Free open source vector illustration.
https://inkscape.org/en/
GIMP: Free open source photo manipulation.
http://www.gimp.org/
Scribus: Free open source desktop publishing.
http://www.scribus.net/
Infinite Painter and Designer: Painter is a digital painting app available for Android and also iOS. Designer is the best vector app for Android. Free as well as paid versions.
http://www.infinitestudio.art/
Krita: Free open source robust digital painting app.
https://krita.org/en/
Fonts
Font Library: Free fonts. Interesting fonts some good, some okay and some not so good.
https://fontlibrary.org/
The League of Moveable Type: Some nice free fonts.
http://www.theleagueofmoveabletype.com/
Editors and Viewers
Libre Office: Free open source office suite (Word processor, spreadsheet, database, and presentation software.
https://www.libreoffice.org/
Xodo: Free PDF for mobile and online. I use this exclusively these days.
https://www.xodo.com/#
PDF-Exchange Editor: A more reasonably-priced alternative to that other PDF app.
https://www.tracker-software.com/