Resources
Dynasty Trade Calculator
Link: https://dynasty101.com/trade-calculator/
This website uses an Excel database to calculate player & future pick values. This database is subject to the website owner's perception of value, but is a common benchmark in Dynasty communities.
Although everyone values players/picks differently, many players use this to see if the value of a trade is within the ballpark of reasonable.
Spotrac.com (Player Contract Info.)
Link: https://www.spotrac.com/nfl/cap/
This website tracks all current player contracts (and team salaries). If you are interested if a team has committed to a player and for how long, enter the player's name into the search bar, and their contract profile (with contract options) will be presented.
Before trading for a player, take a look at their current contract to make sure you are comfortable with their contract situation.
FantasyPros.com (Dynasty Player Rankings)
Link: https://www.fantasypros.com/nfl/rankings/dynasty-overall.php
FantasyPros is a free resource for dynasty player rankings. Although there are multiple ranking websites out there, FantasyPros is a very popular one. You can use the filters to sort by player position, avg. draft position, rookie status, etc. This list factors in current and potential player situation, so although a player may not be a starter this year, if they are paired with good teammates and are young, they may have a higher ranking than a current starter who may be older.
If you need to improve your team, or are looking to trade away players, you can use this website to see where other people may value any given player.
Player Profiler
Link: https://www.playerprofiler.com/
PlayerProfiler.com is a website that provides player statistics for current and previous NFL players. It provides college stats (with positional rankings overall), Combine stats (with percentile rankings), and Comparable NFL Player profile (who has returned similar measurables).