Top 3 Java Telnet Projects

AnotherTerm

4 166 8.3 Java

Local PTY, USB and Bluetooth serial ports, SSH and Telnet terminal client for Android. Xwayland support (in dev only).
tn5250j

6 124 0.0 Java

A 5250 terminal emulator for the AS/400 written in Java

Project mention: [Rant] Your Software Isn't the Only One Our Company Uses FFS | /r/sysadmin | 2023-12-07

Your users are probably using some of the extended functionality from IBM's client, but keep in your back pocket that third party tn5250 clients will also work. An example that supports TLS (telnet over TLS, or telnets) is tn5250j, which runs in a JVM.

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.
petscii-bbs

6 109 9.6 Java

A Java framework for building highly customizable PETSCII-enabled BBS, accessible from Commodore 64/128

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).