Which tools and techniques do you use for designing slogans on website? I tried this one but I wasn't satisfied with it. There is little choice of usable designs and it is aliased in firefox (in chrome is was better).
In my opinion, the simpler the better. A complicated logo (what I believe you are trying to say you want) is actually harder for a client to remember. A simple logo is usually more pleasing and much easier to remember (such as just a typography effect). Mess around just typing the name of the website in different fonts and sizes. Try putting a box around the words etc.
It's best not to use online tools for logos because they tend to look cheap and "cheezy".
Consider getting your logo (slogan) created for you, as discussed in this PW question.
A great place to start is to search through font websites such as Font Squirrel (http://www.fontsquirrel.com/) and find some unique typefaces.
You can use their "test drive" feature to type your brand into. This will give you a quick preview of some possibilities.
Once you have a few you like download the ones you want and load them into your graphics program for further development.