This page contains a brief overview over the historyof the AppImage project, as well as previous bundling projects.
January 2004 - Initial release of klik - Simon Peter launches klik, a predecessor of AppImage
December 2005 - Linux.com reports on klik, the AppImage predecessor
July 2006 - Interview with Simon Peter, creator of klik
August 2007 - Glick - Red Hat employee Alex Larsson releases glick, the first in a series of projects that led to what now is Flatpak
August 2007 - klik2 - the AppImage predecessor now uses FUSE to mount application images
February 2008 - klik at FOSDEM, Kurt Pfeifle and Simon Peter present the AppImage predecessor
2013 - click - Canonical launches click, a package management tool for Ubuntu Touch
December 2014 - Snappy is launched by Canonical
September 2015 - xdg-app, another series of projects that led to what now is Flatpak
November 2015 - Linus Torvalds endorses AppImage, calling it "just very cool"
January 2017 - linux-appimages.org is launched as part of the openDesktop.org software catalog
May 2017 - Open Build Service supports AppImage, can now build and host AppImages, as is demonstrated live at openSUSE Conference 2017
May 2017 - Flatpak Build Service is planned