The best place to find plugins is the WordPress Plugin Directory at http://wordpress.org/extend/plugins/. There are more plugins every day (as of this writing, there are nearly 4,245) and millions of downloads (22,152,788 and counting). You can search plugins by topic and by tag, as well as see a list of the most popular, newest, and recently updated plugins. This is the best available plugin resource and you should always go here first when looking for a plugin.
You can also do Google searches. I recommend searching for the problem you're trying to solve and see what plugins other users recommend and why. Often, there are multiple plugins that perform similar functions, and you will find the feedback of other WordPress users valuable in choosing between them.
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