The Masters Review offers a quality platform for emerging writers. It also serves as an online and in print publication since 2011 to celebrate new and emerging writers.
Winning Writers vets and lists hundreds of literary competitions around the world. They also host their own competitions for writers and poets.
Submittable is a platform used by journals, funders, festivals, competitions, etc to call for and receive proposals and articles.
Duotrope is a subscription-based service for writers and artists that offers a searchable database of current fiction, poetry, and non-fiction competitions and publication opportunities.