Sleeper

Free league host for fantasy football, basketball, baseball and hockey: create or join public leagues, standard or custom rules, mock drafts, live scoring, league chat and ESPN rankings. Also runs Knockout leagues and free NFL pick'em, survivor and prediction games.

• Free

Long-running fantasy football league host built for deep commissioner customization: custom scoring, rosters and waiver rules, live and slow drafts and auctions, and league types from redraft to keeper, dynasty, best ball, DFS-style and chop leagues. Free NFL playoff leagues.

• Paid

League host for fantasy football and other sports: free public and private leagues with live and instant drafts, FAAB waivers, live scoring and a league feed. Also offers best ball, prize leagues, daily fantasy, pick'em, survivor and bracket games, plus an optional Fantasy Plus subscription.

• Free tier + paid

Free fantasy league host for football, baseball, basketball and hockey, running since 2005: live scoring, league chat, 137 scoring rules, taxi squads, up to 40 keepers, future pick and multi-team trades, email drafts, year-round access and one-click import of ESPN or Yahoo leagues.

• Free tier + paid
• ESPN
• Yahoo

League host for fantasy football, baseball, basketball and hockey. Free leagues run up to 12 teams on standard scoring; the paid Commissioner tier allows up to 30 teams, deep scoring options, keepers and salary cap drafts. Includes live scoring, expert rankings and pick'em games.

• Free tier + paid

Highly customizable fantasy league host for football and many other sports, aimed at dynasty, keeper and redraft leagues: custom rosters and scoring, salaries and contracts, future pick and multi-team trades, very large leagues, league chat and year-round transactions.

• Free tier + paid