A collection of community created IFTTT applets. This post is a wiki so please feel free to add your own creations to the table below. This is intended to house only applets that could not be created by users with the standard triggers & actions in IFTTT (i.e require the use of IFTTT Platform).
Note that these applets are provided by members of the community who often have shared the source code in the linked threads for each wiki entry below. You use these applets at your own risk with no guarantee of support from the author. If you are unsure about what an applet is doing then it is always wise to create your own.
Other resources:
Category  Purpose  Description  Applets  Author 

Behaviour Modification  Swear Jar  Have you got an issue with swearing? Just say “Ok Google, I’ve been naughty.” Saying it out loud will teach you. Also the fact you’ll lose money every time you do!  Swear Jar  @SheaLavington 
Excercise  Save with Strava  Variations on the Monzo applet to save when completing activities in Strava. 
1p/20m (50p/km) 1p/40m (25p/km) 1p/50m (20p/km) 1p/100m (10p/km) 1p/200m (5p/km) 1p/500m (2p/km) 1p/km 1p/mi 
@swok1080 
Google Assistant  Ask Google Assistant to Add to a Pot  Ok Google, add £1 to savings. — Will move £# from your main account into your selected pot. (Great for saving, or rewarding kids after being good, (Ok Google, add £1 to kids pot)) NOTE (Currently, only whole numbers work (£5, £1, etc).  Ask Google Assistant to add money to a pot  @SheaLavington 
Google Assistant  Ask Google Assistant to Withdraw from a Pot  Ok Google, remove £1 from savings. — Will move £# from your pot to your spending account. Naughty Kids? (Ok Google, remove £1 from kids pot) NOTE (Currently, only whole numbers work (£5, £1, etc).  Ask Google Assistant to remove money from a pot.  @SheaLavington 
Round Up  Round Up to Next 10p  Round up to the nearest round 10p value. e.g. £2.79 spend = 1p moved 
Nearest 10p  
Round Up  Round Up To Next £10  This one is for anyone who really likes a Zero at the end of their balance… Will round any card transaction to the next whole £10. e.g. £2.80 spend = £10 moved 
Nearest £10  @BritishLibrary 
Round Up  Round Up Multiplier  Rounds to the nearest whole pound, then multiplies it by the multiplier. E.g. £2.80 spent = 20p x 3 = 60p moved 
2x 3x 4x 5x 
@BritishLibrary 
Round Up  Round Up Transaction Percentage  Move a percentage of the transaction value to a pot. e.g. £2.80 spend = £2.80 * 10% = 28p 
1% 2% 5% 10% 
@BritishLibrary 
Round Up  Split Round Up by Percentage  Put a percentage of a roundup into a pot. e.g. £2.80 spent = 20p * 10% = 2p moved 
10% 20% 30% 40% 50% 60% 70% 80% 90% 
@swok1080 
Savings  Day of the Week Savings Challenge  On Monday save £1. On Tuesday £2. This goes up to £7 on Sunday and then starts again on Monday. Save £1500 a year!  Weekly Savings Challenge  @conradj 
Savings  Reverse 1p Savings Challenge  A savings challenge that gets easier every day! Gradually decrease the amount you’re saving each day to a pot of your choice. On 1st January, you’ll save £3.65. On 2nd January, you’ll save £3.64.  Reverse 1p Savings Challenge  @conradj 
Savings  Save £1 a Day  Every day transfer £#, into a pot of your choice. A challenge aimed at saving you money every day without getting more or less expensive throughout the year.  Save £1 every day  @SheaLavington 
Spending  Withdraw savings when spending in a category  Transfer the transaction value out of a pot if the purchase if from a category. Spend £5 on Transport = Move £5 out of a pot. 
Eating Out Entertainment Groceries Shopping Transport 

Spending  Withdraw from saving when you spend in a country  When you spend in a given country the value of the transaction will be withdrawn from a pot of your choice.  USA  @swok1080 
Round Up  Fully Rounded Multiplier  Multiplies the spare change from a transaction, and rounds that to keep your balance to whole £1’s. e.g, Spend £1.80  gives 20p Change x 2 = 40p, £1.80 + £0.40 = £2.20, and so adds £0.80 to round to a whole £3. 
2x 3x 4x 5x 
@BritishLibrary 
Requested Creations