Alternatives to irc.lc for all platforms with any license

Thunderbird

Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.

Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku
Extensible by Plugins/Extensions Support for IMAP Built-in RSS reader Encryption ... SMTP integration Add-ons Calendar integration Extensions Multiple Account support Protected by Password Tabs Built-in Calendar Categories Customizable Delivery reports Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader Gui HTML Compose Integrated Chat Integrated Password Manager Integrated Web Browser Intuitive Legacy addons support Export to OPML Import feeds from OPML Organize mails POP3 Support Portable Secure File Sharing Support for POP3 Tabbed interface Support for Themes Add a feature

2005 Like
HexChat

HexChat is an IRC client based on XChat for Linux , but unlike XChat it’s completely free for both Windows and Unix-like systems. HexChat was...

Free Open Source Mac Windows Linux BSD PortableApps.com ... Xfce MacPorts XQuartz
IRC Portable Add a feature

194 Like
mIRC

mIRC is a popular Internet Relay Chat client used by millions of people, and thousands of organizations, to communicate, share, play and work with each other on IRC...

Commercial $ $ $ Windows
Chat Colored Text IRC Add a feature

88 Like
irssi

Irssi is a terminal based IRC client for UNIX systems. It also supports SILC and ICB protocols via plugins.

Free Open Source Mac Windows Linux BSD Cygwin
Chat Add a feature

77 Like
KVIrc

KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit. KVirc is being written by Szymon Stefanek and the KVIrc Development Team with the contribution...

Free Open Source Mac Windows Linux BSD PortableApps.com
Chat IRC Portable Add a feature

40 Like
XChat for Linux

XChat is an IRC chat program for both Linux and Windows. It allows you to join multiple IRC channels (chat rooms) at the same time, talk publicly, private one-on-one...
- Discontinued
  The program is no longer updated. Last version, 2.8.8, released in May 2010, can be still downloaded from the official website.
Free Open Source Windows Linux
Chat IRC Add a feature

102 Like
Kiwi IRC

A hand-crafted IRC client that you can enjoy. Designed to be used easily and freely. More friendly than other webirc clients giving the general public an easy option to...

Free Open Source Web Self-Hosted Chrome
Chat IRC Preconfigurable auto-connect Add a feature

22 Like
ZeroChat

An IRC-like internet chatroom hosted on ZeroNet, a distributed network. 0rc is a fully distributed website, and messages are shared through peers using the ZeroNet...

Free Open Source Mac Windows Linux Web Self-Hosted ... Python JavaScript ZeroNet
Decentralized Distributed Python Add a feature

10 Like
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IRCCloud

IRCCloud is an IRC client with a future. Stay connected, chat from anywhere, and never miss a message.

Freemium Web Android iPhone
IRC Offline logs Add a feature

15 Like
Textual

Textual is the world's most popular application for interacting with Internet Relay Chat (IRC) chatrooms on macOS.

Commercial $ $ $ Mac
IRC IRC Themes User friendly Add a feature

21 Like