Every week, talented creators upload Dungeons and Dragons products to the DMs Guild, pricing them as free or pay-what-you-want in order to reach customers and establish their brand. Dozens of new free and PWYW products are added each week alone. It is a lot to sort through. My hope is that highlighting a few of each week's best supplements will help the designers get the attention they deserve.
Papercraft minis are fun to make and are affordable options for GMs. A mimic dice box is a great idea, and I am thinking about doing one for my work desk for paperclips and rubberbands.
Fun selection of magic items. This document is especially geared towards new GMs; it features brief design notes that can help GMs understand how the items might affect their games and suggestions for scenarios in which they might make for good rewards.
This is a really well-developed set of downtime activities based around different guild memberships. You can actually "level up" within guilds, starting off as an apprentice and slowly working your way up to being a master. Probably the best homebrew downtime rules that I have seen on the Guild. Free.