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: North American Soccer League (NASL)           (ID: usl) (Sort: Div) (Playoffs: 1)
    Team: Carolina RailHawks           (Carolina)       (ID: t123c)
    Team: New York Cosmos              (Cosmos)         (ID: t18p7)
    Team: FC Edmonton                  (Edmonton)       (ID: t123n)
    Team: Fort Lauderdale Strikers     (Ft. Lauderdale) (ID: t123p)
    Team: Indy Eleven                  (Indy)           (ID: t1b8h)
    Team: Jacksonville Armada          (Jacksonville)   (ID: t1fsb)
    Team: Miami FC                     (Miami)          (ID: t1kvk)
    Team: Minnesota United FC          (Minnesota)      (ID: t123r)
    Team: Ottawa Fury FC               (Ottawa)         (ID: t1b8i)
    Team: Rayo OKC                                      (ID: t1kvm)
    Team: Tampa Bay Rowdies            (Tampa Bay)      (ID: t123j)
  Kind: pro
  Sport: soccer
  Gender: male
  Country: USA
  State: 
  Level: B
  Season: 2016Spring (current: False)
  Author: NASL Fan
  Note: 
  LotteryNote: 
LeagueEnd

SortBegin
Div: Average Points, Average GoalsDelta, Average GoalsFor, Average
Points HeadToHead, DrawLots
SortEnd

RulesBegin
  PointsForWinInRegulation:  3
  PointsForWinInOvertime:  3
  PointsForWinInShootout:  3
  PointsForLossInRegulation:  0
  PointsForLossInOvertime:  0
  PointsForLossInShootout:  0
  PointsForTie:  1
  PercentOfGamesThatEndInTie:  0.2829582
  PercentOfGamesThatEndInOvertimeWin:  0
  PercentOfGamesThatEndInShootoutWin:  0
  HomeFieldAdvantage:  0.608284
  WeightType:  Pythagorean
  WeightExponent:  1.4
  WhatDoYouCallATie:  draw
  WhatDoYouCallLottery:  lottery
  WhatDoYouCallPromoted:  promoted
  Promote:  0
  PromotePlus:  0
  PromotePlusPercent:  0
  WhatDoYouCallDemoted:  relegated
  Demote:  0
  DemotePlus:  0
  DemotePlusPercent:  0
RulesEnd

GamesBegin
TeamListedFirst: home
4/2/16    Carolina         2-1   Minnesota        (ID: g1q4yw)
4/2/16    Ft. Lauderdale   1-1   Miami            (ID: g1q4yx)
4/2/16    Rayo OKC         0-0   Edmonton         (ID: g1q4yy)
4/2/16    Tampa Bay        0-0   Indy             (ID: g1q4yz)
4/3/16    Cosmos           3-0   Ottawa           (ID: g1q4z0)
4/9/16    Indy             1-1   Ottawa           (ID: g1q4z1)
4/9/16    Miami            1-1   Tampa Bay        (ID: g1q4z2)
4/9/16    Rayo OKC         2-3   Carolina         (ID: g1q4z3)
4/10/16   Cosmos           2-0   Jacksonville     (ID: g1q4z4)
4/10/16   Edmonton         0-2   Minnesota        (ID: g1q4z5)
4/15/16   Jacksonville     2-1   Miami            (ID: g1q4z6)
4/16/16   Carolina         1-0   Ottawa           (ID: g1q4z7)
4/16/16   Indy             2-1   Cosmos           (ID: g1q4z8)
4/16/16   Minnesota        3-0   Ft. Lauderdale   (ID: g1q4z9)
4/16/16   Tampa Bay        1-0   Edmonton         (ID: g1q4za)
4/22/16   Miami            2-3   Rayo OKC         (ID: g1q4zb)
4/23/16   Ft. Lauderdale   1-1   Jacksonville     (ID: g1q4zc)
4/23/16   Minnesota        1-0   Cosmos           (ID: g1q4zd)
4/23/16   Tampa Bay        1-3   Carolina         (ID: g1q50g)
4/24/16   Edmonton         2-0   Ottawa           (ID: g1q4ze)
4/30/16   Ft. Lauderdale   0-1   Tampa Bay        (ID: g1q4zf)
4/30/16   Ottawa           2-0   Miami            (ID: g1q4zg)
4/30/16   Rayo OKC         1-2   Indy             (ID: g1q4zh)
5/1/16    Cosmos           1-0   Carolina         (ID: g1q4zi)
5/4/16    Jacksonville     0-1   Edmonton         (ID: g1q4zj)
5/7/16    Carolina         1-3   Ft. Lauderdale   (ID: g1q4zk)
5/7/16    Indy             1-1   Edmonton         (ID: g1q4zm)
5/7/16    Jacksonville     0-1   Rayo OKC         (ID: g1q4zn)
5/7/16    Miami            0-3   Cosmos           (ID: g1q4zp)
5/7/16    Ottawa           2-2   Minnesota        (ID: g1q4zq)
5/14/16   Carolina         0-0   Miami            (ID: g1q4zr)
5/14/16   Ft. Lauderdale   0-0   Indy             (ID: g1q4zs)
5/14/16   Minnesota        2-0   Jacksonville     (ID: g1q4zt)
5/14/16   Tampa Bay        1-1   Rayo OKC         (ID: g1q4zu)
5/15/16   Edmonton         2-1   Cosmos           (ID: g1q4zv)
5/21/16   Indy             4-2   Minnesota        (ID: g1q4zw)
5/21/16   Rayo OKC         1-2   Ft. Lauderdale   (ID: g1q4zx)
5/22/16   Cosmos           2-1   Tampa Bay        (ID: g1q4zy)
5/22/16   Edmonton         1-0   Carolina         (ID: g1q4zz)
5/22/16   Ottawa           1-0   Jacksonville     (ID: g1q500)
5/27/16   Ottawa           1-2   Ft. Lauderdale   (ID: g1q501)
5/28/16   Cosmos           1-0   Rayo OKC         (ID: g1q502)
5/28/16   Jacksonville     1-1   Indy             (ID: g1q503)
5/28/16   Miami            1-0   Edmonton         (ID: g1q504)
5/28/16   Minnesota        0-2   Tampa Bay        (ID: g1q505)
6/4/16    Carolina         0-0   Jacksonville     (ID: g1q50f)
6/4/16    Ft. Lauderdale   2-1   Cosmos           (ID: g1q506)
6/4/16    Miami            0-0   Indy             (ID: g1q507)
6/4/16    Rayo OKC         1-0   Minnesota        (ID: g1q508)
6/4/16    Tampa Bay        2-1   Ottawa           (ID: g1q509)
6/11/16   Indy             4-1   Carolina         (ID: g1q50a)
6/11/16   Jacksonville     1-1   Tampa Bay        (ID: g1q50b)
6/11/16   Minnesota        3-1   Miami            (ID: g1q50c)
6/11/16   Ottawa           1-1   Rayo OKC         (ID: g1q50d)
6/12/16   Edmonton         2-1   Ft. Lauderdale   (ID: g1q50e)
GamesEnd