ognigiorno

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PostSummary allow you to add a widget with a kind of preview of your posts. You can add a list like the newspaper sites 
or a list of posts really similar to adsense style. You can mix your posts and adsense with the same aspect. 
Every instance of the widget is independent and can be configured separately. 
You can choose the categories to be displayed or if the lias is made of the most recent posts or, if you have statpresscn plugin, 
the most read posts.

PostSummary

Postsummary creates a widget that contains a list of posts with title and the beginning of the text. You can style and add a thumbnail.

Didier Sampaolo

When you write a long post, it is common to add h2 and h3 tags to create sections on a specific topic. This plug-in will search these sections and add a link to each of them at the beginning of your post. Each section will become a named anchor, allowing the user to browse quickly through your post. 
This summary is also understood by major search engines and should improve your CTR (click-through rate) by providing richer snippets.
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wp_summary

wp_summary will automagically show a summary of your post at its beginning, using h1, h2 and h3 tags to create sections.

PostSummary vs wp_summary