NIST TAC Knowledge Base Population (KBP2019) Entity Discovery and Linking Track

Publicly available EDL systems, Entity Linkers/Entity Clusterers/Wikifiers, slot filling tools, other related NLP tools:
(collected and recommended by Heng Ji, highly biased and incomplete, suggestions are welcome)
Publicly Available Name Taggers:

Event Coreference Resolver

Stanford Chinese/Spanish/English CoreNLP tools

Wiki-based linguistically grounded knowledge base