Recommend - Recommendations from people you trust
Searchlight a Colleague - Searchlight helps you write powerful words of support that highlight strengths and work styles, so that your teammate isn’t just a name and resume.
Twitmarks - Twitter bookmarks for the desktop web
Peoople - Find the best recommendations
TWRL - It's like merging Instagram and Texting into one platform.
Recombee - Recommender system as a service that uses advanced Machine Learning and Artificial Intelligence algorithms. Easy to try and evaluate.