You can test-drive CiviCRM by logging in to our online demos. Feel free to click around and try out functionality but be aware that they are publicly viewable so you should not enter personal data on these sites.
Our demo sites are available on each of the three content management systems with which we integrate:
To keep everyone safe, these demos have some limitations: you can't send emails from them; you can't set permissions for Drupal users, and you can't fully explore online payment options. Also, note that other people are likely exploring on the demo sites at the same time as you, so they may be configured strangely, missing functionality or appear in different languages. To prevent things getting too 'strange' we reset all demo data once every day. If you are having trouble working on a demo site, contact the CiviCRM core team via the forum or IRC. If you want to explore functionality that is limited in the demo sites, you might want to install your own site (or get a professional to do so for you).
If you are interested looking at the very latest unreleased functionality that we are currently working on, you can have a look at our development sandboxes. The functionality you see on these sandboxes normally finds its way into the next version of CiviCRM. They are particularly useful if you an interested in getting a sneak peak at new features or want to help test or document an upcoming release.