Top 3 C++ Antlr Projects

Diagon

7 1,428 5.1 C++

Interactive ASCII art diagram generators. :star2:

Project mention: Architecture diagrams enable better conversations | news.ycombinator.com | 2023-08-22

A few more ASCII-based tool that you could add into your workflow are https://arthursonzogni.com/Diagon/#Sequence which can be used to generate the ASCII that you input into something like Typogram (https://google.github.io/typograms/).
For example, input:
  Renderer -> Browser: BeginNavigation()

Surelog

1 329 9.4 C++

SystemVerilog 2017 Pre-processor, Parser, Elaborator, UHDM Compiler. Provides IEEE Design/TB C/C++ VPI and Python AST & UHDM APIs. Compiles on Linux gcc, Windows msys2-gcc & msvc, OsX (by chipsalliance)
WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
gdl

2 261 9.5 C++

GDL - GNU Data Language

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).