Various useful online or bibliographical resources concerning flags and vexilology.
Flags of the World - The oldest and largest flag database on the internet.
Flags of the world on Nationamaster.com
The French Flags of New France
Confederate States of America Flags
Proposals for European flags from Arsène Heitz (1952–1955) - Early 1950s proposals for flags of future European integration and its member countries. Available for free download as a full .pdf overview here.
A thread with open source textures useful for creating textured flags
Generic template for a British colonial flag (empty dark blue field and a Union Jack in the canton)
A sampling of older (and usually short) discussions about flags that can help you with inspiration and critical feedback while you're creating your own. Please don't revive these threads, especially if they've been dead for years. We hope you'll find them useful.
The flag of a British Republic ?
Tips for designing flags of ATL fascist nations
Tips for designing flags of ATL communist nations
Alternate symbols for Nationalist/Fascist Germany
Alternate Tsarist Russian flag
What if all countries had to use canton style flags ?
What if all countries had to use Nordic Cross style flags ?
What if all countries had to use flags with canton and stripes ?
What if all countries had to use Cross of Burgundy style flags ?
How would Slavic flags look like if Russia used a saltire national flag ?
Post-communist flags (for current communist countries) ?
Alternative puppet state flags
Starless Flags: What if all flags have stars removed and add something more original ?
Some ideas for alternative Chinese flags
Help designing a flag for New York
India subdivision flag project
Republic of Colorado Flag Designs
Flag of an ultranationalist Indonesia
Proposals for a flag of a Romanian SSR
Malawi, Burma and Angola Flag Changes
Challenge: Best Jewish SSR flag
Requesting help making a flag: Empire of California
Tools for creating illustrated AH content - A collection of tutorials, resources and recommended software for creating artworks.
Heraldry Resources - A collection of useful resources for creating maps and other cartographic stuff.
Map Resources - A collection of useful resources for creating coats of arms and other heraldic insignia.
Alternate History Media - An overview of various artwork threads on AH.com, for comparison and potential inspiration.