Minimally maintained

Custom Pagers allows administrators to define context-sensitive previous/next pagers for any node type.

The Filter Default module allows you to assign a default input format for new nodes and comments for each role on your site. It adds a 'Defaults' tab to the Administer > Site configuration > Input formats page on which you can manage the assignments.

Drupal 6 users should take a look at Better Formats module, which covers more ground than Filter Default.

Note: This functionality will be built into Drupal 7, so Filter Default will not be maintained beyond Drupal 6.

Adds image preview thumbnails to the file attachment section on node editing pages.

An alternative e-commerce system.

The conference module allows you to organize conferences with Drupal.

Similar, active projects

This module is not actively maintained.

People interested in a currently maintained solution with similar features should consider the Conference Organizing Distribution.

Features of conference module

It implements a mechanism to post papers, to manage reviewers and to assign reviewers to papers. A paper is an arbitrary node with an attached file and a review is an arbitrary node assigned to a paper. It also takes care for the access permissions to papers and reviews.

1. Automatic Content Type generation using CCK
2. Ability to submit Abstracts via online methods, both by uploading files and by typing in the content as a part of a node
3. Automated Paper Number generation
4. Has fields to take in Keywords for a given paper.
5. Ability to create Revisions of the current paper on Reviewer Request based on Drupal's node revisions.
6. The Conference Manager can assign papers to reviewers as well as take the final decision on whether a paper is accepted or rejected or request for resubmission
7. Complete Privacy of Papers / reviewers from various authors and reviewers, only the manager is able to see all reviews and papers in one go.

You can read more about the original, and ongoing, inspirations behind this module at Embedding RPGs into Drupal.