DXO is having a year-end sale on all of their most popular software, you can save up to 30% off their great software.
Nik Collection 3
I have used the Nik Collection plugins for years, and version 3 is a nice update over the previous version. I especially like SilverEFX Pro 2 and think it makes the whole collection worth it on its own.
DXO PhotoLab 4
I love what DXO has done with PhotoLab 4, and honestly, it's worth the price just for DeepPRIME noise reduction, it gives almost magic results. There is a plugin included to make switching between Lightroom and PhotoLab 4 quick and easy, as well as nondestructive.
DXO Filmpack 5
I've always found Filmpack fun, and it's one of the best of its kind on the market.