Marketplace

Themeforest

http://themeforest.net/

one of multiple platforms to sell 'files', organisator is Envato (envato.com)

profit rate for seller:

  exclusive sale: 50%(min) - 70%(more than 75000$ sales volume, 1% more each 3750$ more sales volume)
  non exclusive: 33%

for selling something you have to register at envato, after which you can offer a file:

1. all files in one single ZIP-file

and a lot of meta information to present the product in the shop:

1. Name,
2. Description,
3. Thumbnail,
4. Preview,
5. optional WordpressTheme,
6. Categories,
7. Highres,
8. Compatibles Browsers,
9. Compatibility(facebook,JomSocial,Bootstrap<version></version>),
10. SoftwareVersion(Joomla<version></version>,Other[expandable,]),
11. ThemeforestFiles,
12. Columns,
13. Layout(Fixed,liquid,responsive,N/A),
14. DemoURL
15. Tags
16. Message to the Reviewer

after a review the product appears in the shop

for a search there exists a JSON-Api: http://marketplace.envato.com/api/documentation

Mojomarketplace

http://www.mojomarketplace.com

 exclusive sale: 
 # 50%, 
 # 55% (more than 200 Sales), 
 # 60% (more than 500 Sales),
 # 65% (more than 1000 Sales),
 # 70% (more than 2000 Sales)
 non exclusive: 25%

Metainformation:

1. Categories
2. Sub-Categories
3. Title
4. Providing a Detailed Item Description
5. Recap for your Description
6. Live Demo URL
7. Version Number
8. Change Log
9. Dependencies
10. Compatible Browsers
11. Thumbnail and Preview Images

  Square Thumbnail: 66 x 66
  Preview Images: 590 x 330
  Screenshots: 960 x xxx

1. Documentation
2. Demo Data
3. Product Files

  inside a zip file: product.zip

1. Comments to Reviewer
2. Exclusivity

an example of a template wizard (for wordpress)

 http://headwaythemes.com/