Adding support for LEFT JOINs and IS NULL conditions to Drupal's EntityFieldQuery has been asked for in d.o. issue queues and discussed over and over again. Although in Drupal 8 EntityFieldQuery has been rewritten, and now supports exists() and notExists() conditions, implementing it in Drupal 7 is still slightly hack-ish. Doing it in dynamic, parametrisable way however seems to be something new entirely.

Recently in Development

If you happen to have Commerce Stock module enabled, while at the same time you have removed Commerce Line Item: Delete button field from your Shopping cart form view, you most probably faced (or are still facing) some PHP warning and notices when using any of the shopping cart buttons.
Akeneo
Akeneo is an open source Product Information Management (PIM) system designed for retailers looking for efficient answers to their multichannel needs. Platform.sh is a groundbreaking hosting and development tool for web applications. It extends a branch-merge workflow to infrastructure so that every branch can be tested as if it were in production, and scales for the largest sites.
The Tower of Babel By Pieter Brueghel
Step-by-step guide to translating a Commerce Kickstart 2-based store, including multilingual products and search.
Don't Drink Poison by Carissa Rose Stevens
Ever got an invitation to one of those "fancy" Microsoft Office Live Meetings, only to end up scratching your head how the heck could you access it from your Mac? Especially if you were running Mavericks?
Mexican Marketplace by Anne Gifford
This tutorial will guide you through all the steps required to replicate the Commerce Marketplace demo site on your own server, and then explain how its behaviour differs depending on various configuration settings.

Recent commits

commerce_marketplace_paypalc9a506717 Apr
First step to supporting PayPal chained payments
commerce_marketplace_paypal7aca36417 Apr
Adaptive Payments: consistent watchdog messages
commerce_marketplace_paypal0873c5116 Apr
Initial, *very rough* support for parallel PayPal Adaptive Payments
commerce_marketplace_ogone62325d416 Apr
Alter data sent to Ogone only if payments should be sent to the main store
commerce_marketplace_paypalf2ce8e014 Apr
WPS: support for marketplace multiple orders with payments sent to the main store
commerce_marketplace_paypala80833e14 Apr
Very initial commit

Maciej on drupal.org