At Acquia we love Drupal and we are proud to give back to the community by contributing code, sponsoring events, organizing Drupal camps and code sprints.
I released Honeypot for Drupal 8 beta 1; Honeypot is one of the most effective and widely-used spam prevention modules for Drupal.
Codefilter is a module used to highlight PHP source code in webpages. It is used on Drupal.org. I recently released an updated version, 7.x-1.1, with some new features.
Download it here: https://drupal.org/project/codefilter
For some Drupal developers or site builders, they've been telling themselves for months to start contributing to Drupal core. Sprints are a chance to get started with in-person training and mentoring from friendly, experienced core contributors. And to start becoming familiar with Drupal 8!
If folks are working already on core, sprints are a fantastic opportunity to meet other contributors, hang out in person, mentor newbies, and work on manageable tasks in the Drupal core queue.