Is there a viable module for image upload, gallery  available for Drupal 7?

Most of the image tools are still stuck in Drupal 6 land. Many different solutions were developed for Drupal6 because image handling was not a core feature. The range of modules available for D6 solved the particular needs of developers focused on specific use cases.   Over time, the imagefield and imagecache approach became accepted as a best practice, so that approach was brought into Drupal core. Add the views module, and you have a very powerful toolset. Check out these resources for insight into managing images in D7 http://drupal.org/documentation/modules/image http://geoffhankerson.com/node/173 The Gallery Formatter module is also worth a look http://drupal.org/project/galleryformatter

Most likely you will not find a full end user feature in drupal except if you are using a distribution. Almost all modules provide "infrastructure" or framework functionality to build for example data structure, data queries, business logic etc. With these components you can configure exactly the features you need. You may have a look at the drupal application stack poster at http://goo.gl/e76eH0

Yes, check http://jamestombs.co.uk/2011-05-26/create-album-based-image-gallery-drupal-7-using-fields-and-views.