1. Dislexicon - Takes common words and adds suffixes and prefixes. It even gives you the meaning. This site is great for finding short domain names that look like they could be real words.
2. JustDropped - This site lets you search for domain names that have recently expired. You get a few searches for free with limited results. I’ve found that the free searches are usually adequate for my needs.
3. Word Mixer - This one lets you enter up to five words which are mixed up into new, semi-pronouncable words. The same website also has a couple other tools that are useful such as the random words tool which is hit or miss, and the mixer seeds page.
4. WordFinder - This is actually a tool for crossword puzzles, but it can also be very useful for finding a domain name.
5. DomainsBot - This search engine is geared specifically towards finding a domain name. It works best if you’re looking for a compound-word domain rather than an invented word.
6. Online Generators - If all else fails, sometimes you’ll find a gem using one of these online generators. This is usually a last resort for me though, they tend to suck up your time without out producing much.