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Live networks:
RaiBlocks: 4 Oct 2015 (https://github.com/clemahieu/raiblocks/releases/tag/V7.1.0)
IOTA: 11 July 2016
ByteBall: 25 Dec 2016 (https://github.com/byteball/byteball/releases/tag/v1.0.0)

Public test releases:
RaiBlocks: 11 Nov 2014 (https://github.com/clemahieu/raiblocks/releases/tag/VERSION_1)
IOTA: 8 Aug 2016 (https://github.com/iotaledger/wallet/releases/tag/v1.0.3)
ByteBall: 5 Sep 2016 (https://github.com/byteball/byteball/releases/tag/v0.1.1)

GitHub start:
RaiBlocks: 1 May 2014 (https://github.com/clemahieu/raiblocks/commit/e387c894861f4d04dab24e2d230ef394e58eaffa)
IOTA: 20 Jul 2016 (https://github.com/iotaledger/wallet/commit/b3e82b9673fbfc0bfcc30286a21ff4db9b8ea89b)
ByteBall: 5 Sep 2016