You can add leagues, big or small, to Sports Club Stats.
   It's free.
   It's easy.
   Just email import@sportsclubstats.com the:
      structure
      schedule
      and rules
   In a few minutes you'll get back a link to the league.
   Play around, have fun, you won't break anything.
   I look forward to seeing what you create.

Info about the various settings:
   https://docs.google.com/document/d/1-UneDNk6tkOrc_B-WBnGnc5KGiy2kttXC2fW8dR7QzM/edit?hl=en

For example, here is what created this league:

LeagueBegin
  League:       Six Nations Championship (6 Nations 2016) (ID: pro12) (Sort: Lottery)
    Conference: Six Nations                               (ID: d13n5) (Sort: Conf) (Playoffs: 1)
      Team:     England                                   (ID: t1kkr) (FairPlay: 9)
      Team:     France                                    (ID: t1kks) (FairPlay: 5)
      Team:     Ireland                                   (ID: t1kkt) (FairPlay: 2)
      Team:     Italy                                     (ID: t1kku) (FairPlay: 4)
      Team:     Scotland                                  (ID: t1kkv) (FairPlay: 5)
      Team:     Wales                                     (ID: t1kkw) (FairPlay: 5)
  Kind: pro
  Sport: rugby
  Gender: male
  Country: Europe
  State: 
  Level: A
  Season: 2016 (current: True)
  Author: Johkey3
  Note: 
  LotteryNote: 
LeagueEnd

SortBegin
Lottery: Points, GoalsDelta, FairPlay

Conf: Points, GoalsDelta, FairPlay
SortEnd

RulesBegin
  PointsForWinInRegulation:  2
  PointsForWinInOvertime:  0
  PointsForWinInShootout:  0
  PointsForLossInRegulation:  0
  PointsForLossInOvertime:  0
  PointsForLossInShootout:  0
  PointsForTie:  1
  PercentOfGamesThatEndInTie:  0.03333333333
  PercentOfGamesThatEndInOvertimeWin:  0
  PercentOfGamesThatEndInShootoutWin:  0
  HomeFieldAdvantage:  0.5539383562
  WeightType:  PercentOfPointsWon
  WeightExponent:  0.458
  WhatDoYouCallATie:  drawn
  WhatDoYouCallLottery:  lottery
  WhatDoYouCallPromoted:  Championship
  Promote:  1
  PromotePlus:  0
  PromotePlusPercent:  0
  WhatDoYouCallDemoted:  Wooden Spoon
  Demote:  1
  DemotePlus:  0
  DemotePlusPercent:  0
RulesEnd

GamesBegin
TeamListedFirst: home
2/6/16    France     32-21   Italy      (ID: g1puen)
2/6/16    Scotland   9-15    England    (ID: g1puep)
2/7/16    Ireland    16-16   Wales      (ID: g1pueq)
2/13/16   France     10-9    Ireland    (ID: g1puer)
2/13/16   Wales      27-23   Scotland   (ID: g1pues)
2/14/16   Italy      9-40    England    (ID: g1puet)
2/26/16   Wales      19-10   France     (ID: g1pueu)
2/27/16   England    21-10   Ireland    (ID: g1puev)
2/27/16   Italy      20-36   Scotland   (ID: g1puew)
3/12/16   England            Wales      (ID: g1puex)
3/12/16   Ireland            Italy      (ID: g1puey)
3/13/16   Scotland           France     (ID: g1puez)
3/19/16   France             England    (ID: g1puf0)
3/19/16   Ireland            Scotland   (ID: g1puf1)
3/19/16   Wales              Italy      (ID: g1puf2)
GamesEnd