1. Freemium
1.1. Codility
1.1.1. http://codility.com/pricing/
1.2. Dropbox
1.2.1. http://dropbox.com/
1.3. Evernote
1.3.1. http://www.evernote.com/about/premium/
1.4. Highrise
1.4.1. http://highrisehq.com/signup
1.5. MailChimp
1.5.1. http://www.mailchimp.com/pricing
2. Free trial, Paid only
2.1. BookingBug
2.1.1. http://uk.bookingbug.com/prices
2.2. uberVU
2.2.1. https://www.ubervu.com/pricing/
2.3. Vzaar
2.3.1. http://vzaar.com/pricing
3. Pay as you go
3.1. Beetil
3.1.1. http://www.beetil.com/pricing
3.2. CapsuleCRM
3.2.1. http://capsulecrm.com/signup/
3.3. Cloudcontrol
3.3.1. http://cloudcontrol.com/pricing/
3.4. Heroku
3.4.1. http://heroku.com/pricing
3.5. MailChimp
3.5.1. http://www.mailchimp.com/pricing
4. Paid only
4.1. Birchbox
4.1.1. http://www.birchbox.com/
4.2. CrazyEgg
4.2.1. http://www.crazyegg.com/plans
4.3. Litmus
4.3.1. http://litmus.com/pricing
4.4. Mogotest
4.4.1. http://mogotest.com/features
5. Optional
5.1. One time payments
5.1.1. SocialGo
5.1.1.1. https://signup.socialgo.com/plans
5.2. Additional monthly subscriptions
5.2.1. Dnsimple
5.2.1.1. https://dnsimple.com/
5.2.2. SocialGo
5.2.2.1. https://signup.socialgo.com/plans
5.2.3. Wordpress
5.2.3.1. http://en.wordpress.com/products/