I have some simple scripts like blogs, forums, and so on. They are not of high quality but I want to sell them.

The problem is that I cannot build a professonal website. But I want to sell my work.

Where can I find a marketplace for such items?

Note that I can't sell with Themeforest because they have a strict moderation.

The mind boggles a bit. You can build forums and blogs but can't build a simple website? You think people will want to buy your admittedly not very good scripts? Bit confused here. You can't use theme forest etc due to strict moderation?

You can self host i suppose. Use something like WP with woocommerce. Maybe EDD (easy digital downloads). You will need a ticket tracking system and thinK v carefully about how you will support customers. Selling goods that are not fit for purpose could land you in trouble, depending on where you are trading from. Good luck.