MathSciNet (To search and find mathematical research articles)
Research Gate (Platform for being up-to-date with current research by following people and their research)
Google Scholar (To search and find research articles)
arXiv (To search and find research articles uploaded by authors)
MRef (Reference templates including LaTeX and BibTex entries for publications indexed in MathSciNet)
MRLookup (Search engine for publications indexed in MathSciNet)
mathjobs.org (Maintained by the AMS)