Ghost in the Shell [1995]
-Theatrical film with an original story loosely based off Masamune Shirow's manga of the same name.
*First animated entry of the franchise

Ghost in the Shell 2 - Innocence [2004]
-Direct sequel to 1995 theatrical film.

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Ghost in the Shell - Stand Alone Complex [2002-2003] 26 episodes
-Reimagined series featuring some of the cast from the 1995 film in a reimagined universe.

*The Laughing Man
-Abridged version to the Laughing Man underlying story featured in S.A.C; features both reused and new footage.

Ghost in the Shell S.A.C. 2nd GIG [2004-2005] 26 episodes
Second season of Stand Alone Complex

*The Individual Eleven
-Abridged version to the Individual Eleven underlying story featured in 2nd GIG; features both reused and new footage.

Ghost in the Shell Stand Alone Complex - Solid State Society [2006]
-OVA/Film that follows the events 2 years after the conclusion of S.A.C. 2nd GIG.

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Ghost in the Shell Arise [2013] "4 theatrical filmS/OVA's"
-Reimagined series featuring a cast from S.A.C with vastly different origins in a new setting.

Ghost in the Shell: Alternate Architecture [2015] 8 episodes
-Reordered version of Arise (ep. 1-8) with 2 new episodes (9-10), that set up a new theatrical Arise film.

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Recommended Viewing Order -
***None of the series are connected, rather, they are reimagined series within the Ghost in the Shell franchise.
As a result, it is difficult to prescribe a practical viewing order. Most importantly, jump in to each series with an open mind.
Lastly, many of these series require multiple viewings... so good luck.

However I suggest...

1. GTS S.A.C. [2003-2006]
S.A.C. -> Laughing Man -> 2nd GIG -> Individual Eleven -> Solid State Society

2. Ghost in the Shell [1995] -> Ghost in the Shell 2: Innocence [2004]

3. Arise [2013-2015] -> Alternate Architecture [2015] episodes 9-10 -> Arise Theatrical Movie [2015]