Bootstrap This - 29+ Free Bootstrapping Tools That Help You Save Money
2. PickyDomains.com - Pay per result naming service, $50 for domain/name/product line, slogan.
3. Reddit/Freebies - Community moderated daily updated freebies list.
4. AppSumo.com - Groupon clone for buying enterprise software.
5. JetRadar.com - Low airfare meta searchengine (searches through 700+ airlines to find best deals normally available through direct purchase on airline sites only).
6. SideJobTrack.com - Free invoicing.
7. MoneyBookers.Com (Skrill) - PayPal alternative, cheap way to accept online payments/credit cards (25 cents + 3%, please refer to site for exact details)
8. Kodesk.com - Office sharing. You can both buy and sell extra office space, including by the hour.
9. PRLog.com - Free press-release distribution.
10. InternMatch.com - Own slaves legally.
11. RetailMeNot.Com - Discount coupons, business section available.
12. OpenOffice.Org - Free MS Office alternative.
13. WaveAccounting.com - Free online accounting SaaS
14. SysAid.com - Free helpdesk software. ZenDesk.com is worth paying for.
15. CouchSurfing.com - Yes, I do want to let complete stranges sleep in my house for free (so I can do the same when I travel).
16. SubmitYourStartup.Com - Partly outdated list of sites that accept startup submissions.
17. Vator.Tv - Social network for startups
18. LowerMyBills.com - Loan/Insurance/Internet Provider/Phone Carries comparison service.
19. Score.Org - Free consulting from retired entrepreneurs (available in certain areas only).
20. Logaster.com - Free logos. Bad English gratis.
21. 99Designs.com - Cheaper alternative for design work. Designers hate the site, so it must be good.
22. MinuteBox.com - Hire doctor/lawyer/coffee enema expert - pay by the minute. Lots of experts, typical pay is around $2.50 a minute. Not sure, but there's probably some sort of minimum required.
23. HelpAReporter.Com - Free publicity (pitch your business directly to journos working on certain stories).
24. AVG - Free antivirus.
25. Weebly.Com - Free website creator.
26. GotFreeFax.com - Send free fax online. Limited to 3 pages, US and Canada only.
27. RememberTheMilk.com - Free To-Do list, iPhone and Android support.
28. Zamzar.com - Free online file converter. Let's pass a law that mandates that only one extension (how does .file sound) is allowed!
29. Join.Me - Free webcast/webconference SaaS.
P.S. I have not included eBay, Skype, etc. since everybody knows about those. Did I miss something? Send me a message.