After Effects Plugins and Presets Worth Installing
Answers best after effects plugins and presets

Every plugin you install is a dependency, a licence to track and a piece of your project file that nobody else can open. The question is not whether it is good. It is whether it earns that.
The free ones that stay installed
FX Console, from Video Copilot. In a category of plugin nobody talks about, which is the one that removes small frictions. It puts effects, presets and searches into one palette bound to a key, and it saves a few minutes on every single project. It is free, it has been stable for years, and it is here.
Animation Composer, from Mister Horse. A library of transitions, presets and text animations with a free tier that covers most of what anyone needs. The reason it is worth having is not the presets themselves but the discipline they impose: a consistent set of moves across a project, which is what makes a film look designed. misterhorse.com/animation-composer.
Scripts rather than plugins. Easing helpers, layer renamers, colour pickers. Unglamorous and used hourly. Many are free, most are cheap, and they are a better first purchase than any effects pack.
Where to look
School of Motion's roundup is thorough and honest about what is free and what is not. Maxon's guide ranks by the job rather than by the brand. Motionimo's list of free plugins is the shortest and the most practical of the three. And PremiumBeat's free plugin collection is older but still contains things people use daily.
The paid ones, and the honest case for each
The ones that replace a day of work. A particle system, a proper 3D camera tracker, a character rig. If the plugin does something that is genuinely days of manual work, the licence pays for itself on one job.
The ones that are a style. Motion blur, glow, film emulation, lens flares. Powerful, immediately visible, and the reason a lot of work looks like everyone else's. Use them sparingly or the client can tell.
The ones that are a subscription. This is the real decision now. A plugin that costs a monthly fee has to earn a monthly fee, and most do not: you use it once, forget to cancel, and pay for a year. Buy perpetual licences where the choice exists.
The four costs people forget
Compatibility. A plugin that has not been updated since the last After Effects release is a project that will not open. Before installing anything, check the last update date.
Handover. A project using six plugins opens on the client's machine with six holes in it.
Update friction. Every application update now comes with a list of plugins to check. Six plugins is a few minutes; twenty is an afternoon.
Debugging. When something renders wrong, the first suspect is always the least-known plugin in the chain.
Where these sit in real work
On a brand film the plugin that earns its place is almost always the boring one: the one that speeds up the workflow or holds a graphic system together. The showy ones are used on jobs where the effect is the content, which is a much smaller share of client work than the plugin market implies.
If your project needs a specific effect rather than a general style, describe what it should look like and the answer will be whether it needs a plugin at all, or twenty minutes of hand animation.