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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

3. vCard - Wikipedia

   en.wikipedia.org/wiki/VCard

   vCard. vCard, also known as VCF (Virtual Contact File), is a file format standard for electronic business cards. vCards can be attached to e-mail messages, sent via Multimedia Messaging Service (MMS), on the World Wide Web, instant messaging, NFC or through QR code.

4. Business card - Wikipedia

   en.wikipedia.org/wiki/Business_card

   A Oscar Friedheim card cutting and scoring machine from 1889, capable of producing up to 100,000 visiting and business cards a day. Business cards are cards bearing business information about a company or individual. [1] [2] They are shared during formal introductions as a convenience and a memory aid.

5. Telegram (software) - Wikipedia

   en.wikipedia.org/wiki/Telegram_(software)

   Telegram Messenger, commonly known as Telegram, is a cloud-based, cross-platform, instant messaging (IM) service. It was originally launched for iOS on 14 August 2013 and Android on 20 October 2013.

6. WeChat - Wikipedia

   en.wikipedia.org/wiki/WeChat

   WeChat or Weixin in Chinese ( Chinese: 微信; pinyin: Wēixìn ( listen ⓘ); lit. 'micro-message') [a] is a Chinese instant messaging, social media, and mobile payment app developed by Tencent. First released in 2011, it became the world's largest standalone mobile app in 2018 [4] [5] with over 1 billion monthly active users.

7. Business models for open-source software - Wikipedia

   en.wikipedia.org/wiki/Business_models_for_open...

   Also, providing goods like physical installation media (e.g., DVDs) can be a commercial service. Open-source companies using this business model successfully are, for instance RedHat, [7] IBM, SUSE, Hortonworks (for Apache Hadoop ), Chef, and Percona (for open-source database software).