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:     Rugby World Cup 2019 (RWC 2019) (ID: 1a1xe) (Sort: Lottery) (Playoffs: 8)
    Division: Pool A                          (ID: d15ne) (Sort: Pool) (Playoffs: 2)
      Team:   Ireland                         (ID: t1xc8)
      Team:   Japan                           (ID: t1xca)
      Team:   Russia                          (ID: t1xcg)
      Team:   Samoa                           (ID: t1xcp)
      Team:   Scotland                        (ID: t1xch)
    Division: Pool B                          (ID: d15nf) (Sort: Pool) (Playoffs: 2)
      Team:   Canada                          (ID: t1xcn)
      Team:   Italy                           (ID: t1xc9)
      Team:   Namibia                         (ID: t1xcb)
      Team:   New Zealand                     (ID: t1xcc)
      Team:   South Africa                    (ID: t1xci)
    Division: Pool C                          (ID: d15ng) (Sort: Pool) (Playoffs: 2)
      Team:   Argentina                       (ID: t1xc2)
      Team:   England                         (ID: t1xc4)
      Team:   France                          (ID: t1xc6)
      Team:   Tonga                           (ID: t1xcq)
      Team:   United States                   (ID: t1xcj)
    Division: Pool D                          (ID: d15nh) (Sort: Pool) (Playoffs: 2)
      Team:   Australia                       (ID: t1xc3)
      Team:   Fiji                            (ID: t1xc5)
      Team:   Georgia                         (ID: t1xc7)
      Team:   Uruguay                         (ID: t1xck)
      Team:   Wales                           (ID: t1xcm)
  Kind: pro
  Sport: rugby
  Gender: male
  Country: RWC
  State: 
  Level: A
  Season: 2019 (current: True)
  Author: Johkey3
  Note: 
  LotteryNote: 
LeagueEnd

SortBegin
Lottery: MoveClinchedToFront, Points, HeadtoHead Points, GoalsDelta,
FairPlay, GoalsFor, DrawLots

Pool: Points, HeadtoHead Points, GoalsDelta, FairPlay, GoalsFor, DrawLots
SortEnd

RulesBegin
  PointsForWinInRegulation:  4
  PointsForWinInOvertime:  0
  PointsForWinInShootout:  0
  PointsForLossInRegulation:  0
  PointsForLossInOvertime:  0
  PointsForLossInShootout:  0
  PointsForTie:  2
  PercentOfGamesThatEndInTie:  0.0125
  PercentOfGamesThatEndInOvertimeWin:  0
  PercentOfGamesThatEndInShootoutWin:  0
  HomeFieldAdvantage:  0.8311688312
  WeightType:  PercentOfPointsWon
  WeightExponent:  0.458
  WhatDoYouCallATie:  draw
  WhatDoYouCallLottery:  lottery
  WhatDoYouCallPromoted:  promoted
  Promote:  0
  PromotePlus:  0
  PromotePlusPercent:  0
  WhatDoYouCallDemoted:  relegated
  Demote:  0
  DemotePlus:  0
  DemotePlusPercent:  0
RulesEnd

GamesBegin
TeamListedFirst: home
9/20/19    Japan              Russia          (ID: g1z7kd)
9/21/19    Australia          Fiji            (ID: g1z7ke) (Neutral)
9/21/19    France             Argentina       (ID: g1z7kf) (Neutral)
9/21/19    New Zealand        South Africa    (ID: g1z7kg) (Neutral)
9/22/19    England            Tonga           (ID: g1z819) (Neutral)
9/22/19    Ireland            Scotland        (ID: g1z7kh) (Neutral)
9/22/19    Italy              Namibia         (ID: g1z7ki) (Neutral)
9/23/19    Wales              Georgia         (ID: g1z7kj) (Neutral)
9/24/19    Russia             Samoa           (ID: g1z81a) (Neutral)
9/25/19    Fiji               Uruguay         (ID: g1z7km) (Neutral)
9/26/19    England            United States   (ID: g1z7kk) (Neutral)
9/26/19    Italy              Canada          (ID: g1z81b) (Neutral)
9/28/19    Argentina          Tonga           (ID: g1z81c) (Neutral)
9/28/19    Japan              Ireland         (ID: g1z7kn)
9/28/19    South Africa       Namibia         (ID: g1z7kp) (Neutral)
9/29/19    Australia          Wales           (ID: g1z7kq) (Neutral)
9/29/19    Georgia            Uruguay         (ID: g1z7kr) (Neutral)
9/30/19    Scotland           Samoa           (ID: g1z81d) (Neutral)
10/2/19    France             United States   (ID: g1z7ks) (Neutral)
10/2/19    New Zealand        Canada          (ID: g1z81e) (Neutral)
10/3/19    Georgia            Fiji            (ID: g1z7ku) (Neutral)
10/3/19    Ireland            Russia          (ID: g1z7kv) (Neutral)
10/4/19    South Africa       Italy           (ID: g1z7ky) (Neutral)
10/5/19    Australia          Uruguay         (ID: g1z7kw) (Neutral)
10/5/19    England            Argentina       (ID: g1z7kx) (Neutral)
10/5/19    Japan              Samoa           (ID: g1z81f)
10/6/19    France             Tonga           (ID: g1z81g) (Neutral)
10/6/19    New Zealand        Namibia         (ID: g1z7m0) (Neutral)
10/8/19    South Africa       Canada          (ID: g1z81h) (Neutral)
10/9/19    Argentina          United States   (ID: g1z7m1) (Neutral)
10/9/19    Scotland           Russia          (ID: g1z7m2) (Neutral)
10/9/19    Wales              Fiji            (ID: g1z7m3) (Neutral)
10/11/19   Australia          Georgia         (ID: g1z7m4) (Neutral)
10/12/19   England            France          (ID: g1z7m5) (Neutral)
10/12/19   Ireland            Samoa           (ID: g1z81i) (Neutral)
10/12/19   New Zealand        Italy           (ID: g1z7m6) (Neutral)
10/13/19   Japan              Scotland        (ID: g1z7m7)
10/13/19   Namibia            Canada          (ID: g1z81j) (Neutral)
10/13/19   United States      Tonga           (ID: g1z81k) (Neutral)
10/13/19   Wales              Uruguay         (ID: g1z7m9) (Neutral)
GamesEnd