A small, opinionated open-source kit
You don't need a hundred utilities — you need a handful that are native, free, and respect your machine. Here's a tight open-source kit for Mac developers, starting with the clipboard and branching out. All free; most are MIT or similar.
The list
1. Maccy — clipboard manager
The reason you're here. Free, open source (MIT), native, local-only, keyboard-first. It records everything you copy and hands it back instantly. The single highest-leverage open-source utility on this list for anyone who copy-pastes all day.
Start with the clipboard
Maccy is the open-source clipboard manager we recommend — free, native, private.
2. Rectangle — window management
Snap windows to halves, quarters and thirds with keyboard shortcuts. Open source, native, and the first thing many devs install on a fresh Mac.
3. Flycut — minimalist clipboard (alternative)
If you want the absolute bare minimum for text history, Flycut (based on Jumpcut) is a tiny open-source option. Most people will prefer Maccy's search, but it's good to know the lineage.
4. AltTab — better window switching
Brings Windows-style Alt-Tab thumbnails to macOS. Open source and genuinely useful when you juggle many windows.
5. Stats — system monitor in the menu bar
CPU, memory, network and more, right in the menu bar. Open source, lightweight, and far nicer than opening Activity Monitor.
Why open source for these
Utilities sit close to everything you do — your windows, your keystrokes, your clipboard. Open source means you (or the community) can see exactly what they do, they tend to stay free, and the good ones are maintained for years. For a clipboard manager especially, auditable and local-only is the combination you want.
Frequently asked questions
What open-source clipboard manager should developers use on Mac?
Maccy — free, MIT-licensed, native, local-only and keyboard-first. Flycut is a more minimal open-source alternative.
Are these apps really free?
Yes. Everything on this list is free and open source. Maccy also has a paid Mac App Store listing that simply supports development.
Why prefer open-source utilities?
They're auditable, usually stay free, and the good ones are maintained for years — important for tools that touch your clipboard, windows and keystrokes.