Here’s my selection of top Twitter tools for September 2009; in no particular order:

1) CoTweet: A fantastic service for managing multiple Twitter accounts, ‘CoTweet is a platform that helps companies reach and engage customers using Twitter’ and also lets you monitor trends for each account

2) UberTwitter: the must have app for your Blackberry, UberTwitter easily lets you favourite tweets, check your @replies and DMs as you would on a desktop

3) Topsy: Topsy is a ’search engine powered by Tweets’ and a fantastic monitoring tool to find out who’s Tweeting what (most Tweeted links) about your brand

4) Twitter Search Results on Google (hat tip to the lovely @msamayoa): Ever fancied adding Twitter search onto your Google search results? You can now do that by downloading Firefox add-on Greasemonkey combined with the Twitter Search Results userscript – see screenshot below.

Previously in this series: Top 5 Twitter Tools – June 2009

Have I missed anything out? What other Twitter tools and apps do you use?