I don't like to think in terms of tools, because I believe tools are just a means to an end. That being said, here are 10 tools I am using right now to develop BARconWIFI.com and that you could benefit from.

The best part... they are all free to use.

1. InstaPages: Generate landing pages for conversion. Free trial. Integrates with GA and allows for A/B testing. Tried  LaunchRock also, but I liked this one better because of the functionalities. LeadPages' policy of give me your credit card before I show you anything scared me off, although it seems to have a more complete feature set.
2. Name Checker: Find out if your name is taken (twitter, facebook, others..)
3. SumoMe Tools and small plugins to improve CRO, signups, virality of your content, etc.
4. Google Analytics: Googles Analytics tool for websites and other kinds of products. A must to track conversion and other useful statistics.
5. SocialBro: Analyse twitter social network accounts, hashtags, etc. Get best times to tweet etc.
6. BufferApp:  Buffer your tweets and other message you want to send to your social network.
7. Canvanizer:  Create your own business canvas online, share it and collaboratively edit it.
8. Mail Chimp: Email marketing with analytics. Free. Lets you A/B test.
9. Rapportive: Gather information about people through social networks and their emails. Check this article to find out more about how you can use it to develop contacts and do PR.
10. If This Then That: Automate the internet. Make it work for you. Create triggers for when you do certain things like posting to Twitter, or publishing and article in your blog.

This is all folks!