The Topaz Labs Gigapixel AI sale is ending today. You can get an additional 15% off with the promo code RUMORS15 (coupon code valid for all Topaz products).
The Skylum Luminar 4 Easter discount is also ending tomorrow. You can get an additional $10 off with coupon code PHOTORUMORS (a total of $25 in discounts).
Ending on April 15th: 15% off all DxO software with code GETDXO15NOW (including NIK Collection 2 and DxO PhotoLab).
The Exposure X5 and ON1 promo codes are expiring at the end of April: