nosignup: Websites that require no signup

There are tons of websites out there requiring you to create a user account and login, but few of them really need to do that. This overview promotes websites that can be used without signing up. Click on a category to view it.

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Event planning

hyggelig.org: Simple event planning for you and your friends; Create an event page and send its URL to your guests. They accept or decline online. Provides custom URL, multilingual interface, RSS feed, and source code.
Mobaganda*: Propaganda for your friends; Again, create an event page and send your guests the URL. Provides a custom URL, global email address for all guests and RSS feed, but closed source and English-only interface.

File sharing

Drop.io: The simplest way to share online; Drop.io lets you share files by web, e-mail, phone. Create a drop and start sharing. Drops are protected from search engines. Requires Flash 9. There's also a Firefox extension.
share4pic: Instant Image Sharing Service; Free image hosting service. No custom URL but cookie detection — once you delete the cookies or switch computers, you can't access your stuff anymore.

Reminders

Oh don't forget...: SMS text message reminder app, with ease.; Send reminders to a specific cell number to get reminded about anything.

URL shrinkers

TinyURL: Making long URLs usable! More than 100 million of them.; Now with custom URL aliases!

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