WordPress Toolset has some shortcodes that you can use like widgets.

Twitter

[code]

[twitter username=”yourUsername” count=”tweetsNumber” query=”” avatarsize=”64″]

[/code]

 

Flickr

[code]

[/code]

 

Popular Posts

[code]

[popular_posts count=”numberPosts” thumbnail=”true or false” extra=”desc” cat=”catId” desc_length=”80″]

[/code]

 

Recent Posts

[code]

[recent_posts count=”numberPosts” thumbnail=”true or false” extra=”desc” cat=”catId” desc_length=”80″]

[/code]