azurecurve

The cpl shortcode allows links to be generated when the page exists; allows index or other pages to be built before child or other linked pages. Adds anchor tags to valid links otherwise outputs plain text.
Shortcode allows cpl, Cpl or CPL to be used for conditional page loinks and cbl, Cbl or CBL for conditional blog links. The following formats are valid: 
[cpl slug=”link”]
[cpl title=”this link title”]link[/cpl]
[cpl slug=”link” title=”the link title”]
This plugin is supported with WordPress multisite installations.
This plugin supports language translations. If you want to translate this plugin please sent the .po and .mo files to wordpress.translations@azurecurve.co.uk for inclusion in the next version (full credit will be given). The .pot fie is in the languages folder of the plugin and can also be downloaded from the plugin page on http://development.azurecurve.co.uk.

azurecurve Conditional Page Links

The cpl shortcode allows links to be generated when the page exists; allows index or other pages to be built before child or other linked pages.

agrafix

This plugin adds hyperlinks to specified words in posts and pages. This can be very usefull if you are using complicated words and want to link Wikipedia articles or 
if you just want to improve your seo by linking some interessting words 🙂
<h3>Example</h3>
Your Text: 
 Welcome to a blog about google
Your Plugin-Settings: 
 blog|Wordpress software|http://wordpress.com 
 google|Search engine|http://google.com
Result: 
 Welcome to a <a href="http://wordpress.com" title="Wordpress software" rel="nofollow ugc">blog</a> about <a href="http://google.com" title="Search engine" rel="nofollow ugc">google</a>

agLinker

This plugin adds links to specified words in posts and pages.

azurecurve Conditional Page Links vs agLinker