sigplus 
Even while simple to use, sigplus offers an impressive set of features. Images suitable for gallery preview are automatically generated with cropping and/or centering, and clicking on a preview image brings up a pop-up window overlay (so-called lightbox) showing the original full-size image without navigating away from the current page. Images in a gallery can be displayed in fixed or flow layout, they can be shown on a slider or carousel/rotator, or an image can blend into another using a fancy transition effect. Appearance and behavior are highly configurable including image margin, border, padding, slider/rotator orientation (horizontal or vertical), animation speed, slideshow delay, image sort order, etc.
Despite its versatility, sigplus is completely free. It is a full-fledged product with all features included, there is no need to buy a commercial professional version with extra features or purchase club membership that grants you additional privileges.
Translations included: English, Dutch, French, German, Hebrew*, Hungarian, Polish, Portuguese, Russian, Slovak and Spanish* (asterisk indicates front-end only). Joomla 1.5 users should install plg_sigplus-1.3.x (and optionally mod_sigplus-1.3.x), users of Joomla 2.5 and later should use the package installer pkg_sigplus-1.4.x (click "Download" for the latest version released in the series to date for maximum compatibility).
The one feature I would have liked to have was a timed slide show in the lightbox. I contacted the developer and he added it the next day (to beta). I've installed it and it works great. Can't say better than that.
Only one small detail: I have watermarks at single gallery level and they are always displayed together other photos. How can I avoid this without use the labels.txt? You cannot get by default from configuration parameters.
Thanks and again congratulations.
The "Advanced parameters" section of the sigplus administration back-end configuration page has an entry called "Custom settings" where you can set any parameter value with a name=value syntax you could normally put directly into the activation tag, including those parameters that are not explicitly configurable with user controls on the configuration page (e.g. watermarking). As the corresponding tool-tip text points out, each parameter name and value pair should occupy a single line.
Very likely this review goes to those who sold you the template. :) To our defense, many users (from beginners to experts) have successfully set up sigplus on their website, and sigplus has proved to be compatible with a wide range of templates. Since in the Joomla architecture the template has the last word in what final output is produced, an ill-written template can render any other extension inoperable. An example of such aggressive behavior where the template is removing script references added by sigplus (or any other extension) is included in the sigplus FAQ (with a recommended solution). However, if you strongly believe that there is a fault in sigplus, feel free to contact the developer; the issue you will have raised will be addressed without much delay.
I tested it on Mozilla, IE, Google Chrome, Opera, and Safari. Everything works great.
Thanks alot Levente! 5 stars from me.
Note: Best to create the folders "thumbs" and "preview" in the "cache" folder manually and set the permissions to 757. Otherwise you might run into problems.
A word of caution: setting lenient permissions might pose a security risk, which is why sigplus uses stricter permissions by default when creating these folders.
Thanks guy(s), you did magnificent job.
