Free counter of TheCounter.com: you place a small image on your web-site and they will register information such as when, from where and by using what your visitors have visited your site. You can choose from 4 different counter styles, TheCounter.com logo, logo and visitor count, invisible and traditional style.

Free counter of Counter.com gives you control over the look and feel of your counter. You choose number of digits displayed, one of 12 colors for a background, font and size of digits, a border, visible or hide.

BeSeen Hit Counters created with logo of BeSeen. You choose one of them, send message to BeSeen and copy HTML tag in your page.

Bravenet Hit Counters come in various sizes and colors, and increment when new visitors come to your web page. When you click on your counter it will take you to several pages of useful statistics.

Free-Services.com Counter is available in a huge amount of colors and is free. You fill form, get HTML code, insert in your code and counter is working.

Many ISP add free counters to their hosted sites, as AOL, Angelfire, GeoCities, FortuneCity and, maybe, your own service provider.

Counter of Yahoo is a CGI program to keep record of the raw hits of a web page. It generates a GIF image of the number of hits and returns to the browser as an in-lined image. The program also has a run-time option not to show the digit images, this way the hits can be kept without displaying it. The hits can be be monitored without incrementing from a separate page as well. The program can also can display time and date of any timezone. It has a option to countdown to a specific date (past or future). Almost all of the features are run-time options. This program started as a fun-to-play-with CGI program but due to enormous interest, feature request, input from thousands of you, it has turned in to the most configurable hit counter on the whole World Wide Web and it's free. The program runs on almost all Known Unix platforms, Windows NT, OS/2, VMS and Amiga.

I like use Counter of Webmasters Only Network.

All above is a free services. Of course, there are much more Hit Counters and Trackers as free as paid. You can find them on Adbility.com, Yahoo, CounterGuide.com and other directories.