There are many great blog that publishing quality article everyday out there, you can encourage them (the publisher) to share their article links on your blog, this can be adding some advantages for you and for the other publisher it self, for the publisher can promote their article links through you blog, and you as the blog owner can get traffic from the publisher who want to promote their article, you got free content you show to the visitor, and keeping up to date with other publisher.
This is the most easiest community news plugins to use, install, setting, place a code in page, and add the widget, you’re done. This widely used I ever see on several blogs, I did not find a way to adding captcha, but in the setting area you can added the akismet to prevent spam.
Examples: Divitodesign Community News
Website: FV Community News
This plugins are more complex than FV Community News, as you can see the feature on the official page, some advance features like adding image, custom field, captcha use option, and many more.
Examples: Tripwire Magazine Submit News
Website: TDO Mini Forms
This one is quite new and seems like a promising plugin, quite good for live site. Like the others this one have good admin setting that you can modified. Common field like tags, category, upload images are available too.
Tutorials: Perishable Press
Example: Perishable Press
Website: User Submitted Posts
Website: Interesting Link List
5. Add Link
These are very simple plugin to add a users submit links form on the sidebar. Also there are some option to customize .
Website: Add Link
Website: Community Link Feed
Website: User Link Feed
Rather than a community links submit plugins, this one is an advance contact form form plugins that can be customized as you want, you can make it as a community submitted links features, but it is not completely free, you must pay some bucks for the pro version.
Website: MM Forms Community