tin was based on tass, a newsreader written by Rich Skrenta.
tass itself was inspired by notesfiles, a public domain UNIX version of PLATO Notes written by Ray Essick and Rob Kolstad at the University of Illinois back in 1982.
tass v3.0 (February 14th 1991)
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tass v3.2 (April 23rd 1991) (first version with NNTP support)
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+------------------------tin 1.0 PL0 (August 23rd 1991) (Original announcement text)
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                         tin 1.0 PL1 (September 3rd 1991)
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                         tin 1.0 PL2 (September 25th 1991)
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                         tin 1.0 PL3 (September 30th 1991)
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                         tin 1.0 PL4 (October 3rd 1991)
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                         tin 1.0 PL5 (October 18th 1991)
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                         tin 1.1 PL0 (February 13th 1992)
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                         tin 1.1 PL1 (March 26th 1992)
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                         tin 1.1 PL2 (April 3rd 1992)
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                         tin 1.1 PL3 (May 13th 1992)
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                         tin 1.1 PL4 (June 22nd 1992)
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                         tin 1.1 PL5 (August 11th 1992)
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                         tin 1.1 PL6 (September 14th 1992)
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                         tin 1.1 PL7 (November 15th 1992)
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                         tin 1.1 PL8 (December 6th 1992)
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                         tin 1.1 PL9 (March 20th 1993)
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                         tin 1.2 PL0 (May 25th 1993)
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                         tin 1.2 PL1 (July 14th 1993)
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                         tin 1.2 PL2 (September 25th 1993)
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                         +-----------------------tin 1.3 beta-950211
                                                 |
                                                 [...]
                                                 |
                                                 tin 1.3 beta-950824 (last version by Iain Lea)
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                                                 +------------------------tin 1.3 unoff beta-960613
                                                                          |
                                                                          [...]
                                                                          |
                                                                          tin 1.3 unoff beta-971018
                                                                          |
                                                 tin pre-1.4 971102-------+ ({www,ftp}.tin.org went online)
                                                 |
                                                 [...]
                                                 |
                                                 tin pre-1.4 19990927
                                                 |
                         tin 1.4.0 19991113------+
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                         tin 1.4.1 19991201
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                         +-----------------------tin 1.5.0  19991201
                         |                       |
                         |                       tin 1.5.1  20000103
                         tin 1.4.2 20000205      |
                         |                       tin 1.5.2  20000206
                         |                       |
                         |                       tin 1.5.3  20000221
                         tin 1.4.3 20000502      |
                         |                       tin 1.5.4  20000523
                         |                       |
                         |                       tin 1.5.5  20000613
                         |                       |
                         tin 1.4.4 20000803      tin 1.5.6  20000803
                         |                       |
                         |                       tin 1.5.7  20001104
                         |                       |
                         |                       tin 1.5.8  20010221
                         tin 1.4.5 20010409      |
                         |                       tin 1.5.9  20010723
                         |                       |
                         |                       tin 1.5.10 20011117
                         |                       |
                         |                       tin 1.5.11 20020130
                         |                       |
                         |                       tin 1.5.12 20020427
                         |                       |
                         |                       tin 1.5.13 20020703
                         tin 1.4.6 20020816      |
                         |                       tin 1.5.14 20020926
                         |                       |
                         |                       tin 1.5.15 20021115
                         |                       |
                         |                       tin 1.5.16 20030125
                         tin 1.4.7 20030322      |
                                                 tin 1.5.17 20030407
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                                                 tin 1.5.18 20030602
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                         tin 1.6.0 20030714------+
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                         tin 1.6.1 20030810
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                         +-----------------------tin 1.7.0  20030810
                         |                       |
                         tin 1.6.2 20030910      |
                                                 tin 1.7.1  20030918
                                                 |
                                                 tin 1.7.2  20031104
                                                 |
                                                 tin 1.7.3  20031220
                                                 |
                                                 tin 1.7.4  20040225
                                                 |
                                                 tin 1.7.5  20040615
                                                 |
                                                 tin 1.7.6  20040906
                                                 |
                                                 tin 1.7.7  20041215
                                                 |
                                                 tin 1.7.8  20050321
                                                 |
                                                 tin 1.7.9  20050629
                                                 |
                                                 tin 1.7.10 20050929
                                                 |
                         tin 1.8.0 20051224------+
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                         tin 1.8.1 20060215
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                         +-----------------------tin 1.9.0 20060228
                         |                       |
                         |                       tin 1.9.1 20060409
                         tin 1.8.2 20060425      |
                         |                       |
                         tin 1.8.3 20070201      tin 1.9.2 20070201
                                                 |
                                                 tin 1.9.3 20080506
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                                                 tin 1.9.4 20090211
                                                 |
                                                 tin 1.9.5 20091224
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                                                 tin 1.9.6 20101126
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                         tin 2.0.0 20110823------+ (20th anniversary edition)
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                         tin 2.0.1 20111224
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                         +-----------------------tin 2.1.0 20111224
                                                 |
                                                 tin 2.1.1 20120623
                                                 |
                                                 tin 2.1.2 20121224
                                                 |
                                                 tin 2.1.3 20130812
                                                 |
                                                 tin 2.1.4 20131019
                                                 |
                                                 tin 2.1.5 20131125
                                                 |
                         tin 2.2.0 20131224------+
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                         tin 2.2.1 20140504
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                         +-----------------------tin 2.3.0 20141003
                                                 |
                                                 tin 2.3.1 20141224
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                                                 tin 2.3.2 20151224
                                                 |
                                                 tin 2.3.3 20160327
                                                 |
                                                 tin 2.3.4 20160628
                                                 |
                         tin 2.4.0 20160823------+ (25th anniversary edition)
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                         tin 2.4.1 20161224
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                         tin 2.4.2 20171224
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                         tin 2.4.3 20181224
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                         tin 2.4.4 20191224
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                         tin 2.4.5 20201224
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                         |
                         tin 2.6.0 20210823 (30th anniversary edition)
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                         tin 2.6.1 20211226
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                         tin 2.6.2 20221224
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                         tin 2.6.3 20231224