GW2 TP Accomplice

Guild Wars 2 TP Accomplice can list items on the trading post ordered by price, potential profit, and ROI. You can filter the items by type (Armor, Weapons, etc.) and rarity, as well as setting margins for the maximum and minimum buy price, sell price and potential profit. This allows you to find items that can be flipped for a profit.

TP Accomplice also contains a "Trades" screen, which tracks your previous and current trades.
The buying and selling listings have an indicator to tell you whether you have been outbid or underbid, allowing you to quickly check which of your listings need to be renewed.
Previous sold listings give you an estimation of the profit you gained from each trade.
The "Stats" screen will display how much profit has been made within different time frames.

Happy trading!