WebTechee

When you click an anchor link (#section), sticky headers hide content. 
This plugin adjusts scroll position so the anchored section is fully visible.

Sticky Header Anchor Fixer

Fixes anchor jumps hidden under sticky headers.

andreu

This plugin automatically adds HTML anchor tags to plain text links and email addresses embedded in the content of posts and pages (WordPress already does this by default for comments).
In the plugin configuration page, you can choose to open the links in a new window or in the current window.

AutoLink

This plugin automatically adds HTML anchor tags to plain text links and email addresses embedded in the content of posts and pages.

Sticky Header Anchor Fixer vs AutoLink