IPv6 support, tabbed user interface, Linux emulation, ActiveX scripting...
New inv6.1:
This will be the final version of CRT (being replaced by SecureCRT); extends your ability to customize your workflow and automate routine tasks with new session management and scripting capabilities; numerous minor enhancements and bug fixes for earlier releases; Release Notes - Last Updated: 08.22.08 (v6.1)
Upgrade Meter: 3
New inv6.x:
Support for sending a tabbed session to a new window and cloning a session in a new window, alpha transparency support, optional button bar (allows buttons to be mapped to strings, protocol functions, menu commands, scripts, etc.), support for launching external programs on the local machine through mapped keys and buttons on the button bar, support for several Windows themes, support for customizing the toolbar and menu by dragging and dropping items, new default color scheme, enhanced portability by making a U3 installer available, MSI installer support; numerous minor enhancements and bug fixes for earlier releases; Release Notes - Last Updated: 04.25.08 (v6.0.2)
Upgrade Meter: 5
New inv5.5.x: New Script Recorder, Windows Vista support, improved auto session, improved ANSI color with color schemes, expanded logging options, additional tab support; numerous bug fixes for earlier v5.x releases; Release Notes - Last Updated: 11.02.07 (v5.5.3)
Upgrade Meter: 4
New inv5.2.x: Support for unauthenticated and basic HTTP proxies, new script functions to support working with tabs, new global option to have CTRL+TAB switch to the most recently used tab; numerous bug fixes for earlier v5.x releases; Release Notes - Last Updated: 01.18.07 (v5.2.2)
Upgrade Meter: 4
New inv5.0.4:
Added support for an execute escape sequence (eX&B) in Wyse emulations (5.0.4); added the session name to the "Connection timed out" error message (5.0.3); numerous bug fixes for earlier v5.0.x releases; Release Notes - Last Updated: 11.14.05 Upgrade Meter: 2
New inv5.0: IPv6 support, tabbed user interface (for working with multiple sessions in a single CRT program window), named firewalls (for working with multiple firewall configurations), improved xterm color (256-color xterm support); Release Notes - Last Updated: 06.17.05 Upgrade Meter: 5
New inv4.1: Dynamic log filename generation with support for substitution of date, time, and environment variables; improved support for scalable line drawing fonts Upgrade Meter: 4
New inv4.0.1: File-based configuration of menus, shortcuts, and toolbars; printing enhancements; basic WYSE 50/60 emulation, improved intl. character sets support Upgrade Meter: 5
New in v3.4: NTLM authentication option (when connection to Microsoft Telnet Servers), automatic screen font scaling option; Release Notes Upgrade Meter: 4
New inv3.3: Support for XModem file transfer, improved Win 2000 multiple monitor support, activator utility allows minimizing any session window to the system tray, 230000 baud rate support, support for mapping keys to toggle the scrollbars from the keyboard, various bug fixes for earlier beta releases; Release Notes Upgrade Meter: 5
New in v3.1: Windows 2000 support, Linux console emulation (with ANSI color, built-in Linux keymap, and mouse reporting support), various bug fixes; Release Notes Upgrade Meter: 4
New in v3.0: ActiveX scripting support, session keyboard mapping, session list folder, SCO ANSI terminal and keyboard emulation; Release Notes Upgrade Meter: 5
Pros: Zmodem support, highly customizable, easy to use, SecureCRT version available
Cons: Price relative to freeware clients, lacks some advanced features found in NetTerm