Are you thinking to grow your business or sell your used items in online? You have lot of market place to post. Some of them are free but you have to wait for approval. Some of them are not free, you have to pay for listing. here I am going to introduce some sites for free classified listing. This sites are using same platform so you will be familiar to them easily.
PFB.IM: PFB.IM is a geo classified website for free product listing for buy sell.
Price Beat: PriceBeat.xyz is also a multi country free classified website.
Open Buy Sell: OpenBuySell.com is totally free for listing and a multi country classified listing site.
List Ads: ListAds.biz is same as others and has instant approval without delay.
Beat Your Price: beatyourprice.com is most user active classified website for free instant ads listing.
To keep you ads live you have to re post ads periodically. Because your ads will be remove automatically after certain days and will go to backward when someone post new listing.