ICQ: The earliest online instant messaging tool. Developed by several students in Israel, its biggest feature is its ability to communicate information online in real time. ICQ changed the ideology of the entire Internet and redefined the meaning of modern communication.

QICQ (Tencent QQ): the most popular Chinese instant messaging tool. It provides users with services such as paging, chat, news, audio and video chat, mobile QQ, group meetings, games, etc., with the largest number of users in the world.

MSN Messenger: an instant messaging tool developed by software giant Microsoft. Relying on its powerful operating system platform, financial strength, and technology development capabilities (such as embedding MSN Messenger into the Windows XP operating system), it has become QQ's biggest competitor.

Yahoo Messenger: Currently, Yahoo Messenger has been released to version 6.0. It supports multiple operating systems and other portable wireless devices. Therefore, it has different commercial profit methods from other QQs.

Sina UC (Universal Communic-ation): The original name was "Langma UC" and was acquired by Sina. Its goal is to break away from traditional IM software and make text communication no longer dominant. It organically combines scene modes, video calls, resume uploads, group sending functions, online games, and classmate recording. However, it must be noted that new versions, including old software such as Tencent QQ, have already taken steps to do this.

NetEase POPO: a relatively new instant messaging tool with a certain popularity. It integrates instant chat, mobile text messaging, online entertainment and other functions, and its beautiful skin and expressions are widely loved by netizens.

Sina SMS (Sina SMS): a client instant messaging software launched by the Chinese portal Sina. Formerly the famous Sina Paging, this software is unique and no longer uses the registry mode and adds thread control logic.

GAIM: The author thinks it may be the best instant messaging software in the world. It is compatible with more instant messaging systems, can be used on Microsoft and Linux operating systems, and is compatible with older ICQ and jabber. GAIM comes with Simplified Chinese language.

Trillian: A very powerful instant messaging software that enables users to use multiple instant messaging systems including AOL's AIM and ICQ, Yahoo's Messenger, and Microsoft's MSN Messenger on the same software. Unfortunately, Chinese is not supported.

RealLink: Similar to the functions of ordinary instant messaging software, it has unique identity authentication and data encryption technology, which greatly improves the security of network transmission. Unfortunately, many of RealLink's features are paid.

TOMQ: This is an online instant messaging software developed by TOM.COM company. The content is close to ICQ and OICQ, and voice technology and customized chat avatars are its biggest features.

SICQ: a free green software developed by the WestDog ??team. No installation required, small size, strong scalability, and user name login instead of the ID number of traditional chat tools. The disadvantage is that the function is not powerful enough.

Hello: Released by the famous search engine google, the author has no experience in using it. It is said that this software closely integrates its powerful image management functions with its Blogger, which is its biggest selling point.

AGOO: a newer instant messaging tool. Integrate the functions of communication, games, and file storage into one. It has sophisticated message encryption technology and the world's unique "portable treasure" function, but its lack of popularity is the biggest dilemma it faces.

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