There are a number of freecycling and selling options which have no specialisation, meaning that you can offer any category of item as opposed those that focus on specific types of items. 

These are the most popular ones in Singapore:

• Carousell - Highest Traffic Option
• Olio - Popular and Growing
• The Singapore Really Really Free Market - best option if you don't want to list online
• Online Freecycling Groups - Some are specialised but most are “anything goes”

Good Hood gets a special mention: while you can list anything, it tends to be focused on specific geographic locations (neighbourhoods) and is only active in certain parts of Singapore.