wgPicasa has two versions available.
The lite version is Free of costs, the Pro version is 5 euros only. Both can be used in Joomla using php5.

Feature wgPicasa Lite wgPicasa PRO
Choose thumbnail size Checkmark_25x25 Checkmark_25x25
Config maximum thumbnails per row Checkmark_25x25 Checkmark_25x25
Config maximum thumbnails per page Checkmark_25x25 Checkmark_25x25
Multiple web albums on one site Checkmark_25x25 Checkmark_25x25
Albums available within articles Remove-icon Checkmark_25x25
Showing Hidden/Protected albums Remove-icon Checkmark_25x25
Making different configuration of your album which can be used in menu or article Remove-icon Checkmark_25x25
Select showing username Remove-icon Checkmark_25x25
Select showing text; number of albums Remove-icon Checkmark_25x25
Select showing photo title Remove-icon Checkmark_25x25
Select showing photo description Remove-icon Checkmark_25x25
Styling text and thubmnails by css Remove-icon Checkmark_25x25
Workable with standard SEF Remove-icon Checkmark_25x25
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