TEITOK
TEITOK is a web-based platform for viewing, creating, and editing corpora with both rich textual mark-up and linguistic annotation, initially developed at the Centro de Linguística da Universidade de Lisboa, later at CELGA-ILTEC, and currently maintained at the ÚFAL institute of Charles University, Prague.
The system has a modular design with numerous modules making serving a wide range of different corpus types. Below are some examples of some of those, and the type of corpora TEITOK can deal with. More modules are added frequently, and it is possible to add custom modules as well.
The source is maintained at GitLab and some conversion tools are maintained on GitHub.