With a new era and a rebuilt sim, many of the previous tools fans used during BETA no longer work and may take some time before they're up and running again. Below is a list of resources we've found so far in NEW Blaseball, and futher down you'll find links from BETA, most of which are not currently working.
Reblase, which has replays of games as well as upcoming games and weather
Chartographer: contains several charts and visualisations, including fielding positions (FK)
Astrology: contains stats for all players and teams, including historical records
NEW Season 1 performance stats for all players (you'll need to make a copy of the sheet to sort or filter the data)
Pine's Legal Charts: see how Georgias' players stars stack compared to league averages, plus other stats
Visualisation: Pitcher W/L stats (NEW Season 1)
Userscripts and user styles modify the blaseball website in a variety of ways, for a variety of reasons, from accessibility improvements to simply adding turtles. SIBR has a document collecting many of these here. Below are a few that help with betting, but be sure to check that link for many other useful (and fun) user scripts and styles—
BETTING:
Blaseball Max Bet: reduces strain from excess clicking by defaulting your bets to max (20 chips), saving you half your clicks
Blaseball Betting Stars: shows team star averages and active pitcher stats on the betting page. Requires Blaseball Userscript Options as well to add a setting for spillover (which otherwise breaks the user script).
Blaseball Net Chips: shows you your net gain or loss in chips under each hour of games
ColorBrewer: helps you pick a colour palette for different data visualisations; includes a toggle for colourblind friendly palettes
With the Return of Blaseball, many of the previous tools fans used during BETA have not yet been updated. Below is a list of the resources we had saved during BETA, some of which are actively being worked on, many of which are irrelevant to blaseball in its current form, and others which may simply need someone new to create a similar tool to replace them.
Schedule/Economy
Reblase, good for previous games and future weather
Sibr's S17 schedule and snack income sheet
Stats
Blaseball Reference, non-FK performance stats
Player Viewer - warning: includes player stats (Apple FK)
OLD Player stats - FK-free view, or scroll to bottom to turn on FK stats and Shadow players, if you want
Current Wills vote distribution (this is Forbidden Knowledge)
eDensity visualiser - derived from fancy maths, rather than FK
For Fun
Team and Player Vibes Checker (cool visualisation) (Vibes may have an impact on player performance, but it's not proven... yet)