There are many open-source budgeting app like

• Firefly III https://github.com/firefly-iii/firefly-iii
• Actual budget https://github.com/actualbudget/actual
• BudgetZero https://github.com/budgetzero/budgetzero
• BudgeE https://github.com/linuxserver/budge

might be worth it to connect it to the Wealthfolio interface to have a unified view of budget and networth?