TimelineFX

The following are emitters you can download for free and use with the TimelineFX Editor and module.

Shoot 'em ups A collection of generic shoot 'em up effects featuring explosions, bullets, shield effects and more!
Environment A cool looking collection of different environmental effects including rain, lightning, snow, bubbles, waterfalls and more. Great for implementing dramatic background effects to your games.
Explosions 59 different explosion effects from quick and small to large and dramatic!
Starbursts Many different types of star burst effects, great for fireworks.
Abstract Pixels Various effects that involve just using small pixels as particles to create a varied range of abstract effects.
Fire and Smoke As the title says, lots of realistic looking fire and smoke effects.
Auras and Halos Various Halo effects, great for shield effects, auras or even cursors for highlighting objects in your game worlds.
Flares A full range of bright flares good enough to light up any dark scene!
Liquid Textures These particle effects are designed specifically for exporting as seamless textures, so be sure to view the animation properties of each effect to see how each one should look. Effects including are some lava type textures, water and some more exotic looking liquids!
Light Shows A fun bunch of abstract effects with a range of colourful light effects, like laser lights and flares.
Bonus Bursts A whole bunch of "Bonus Bursts" great for games that have plenty of bonuses to give away, like match three games.
Explosions 2 You can never have enough explosions! This is another explosion pack featuring some nice realistic looking explosions designed especially for sprite sheets (some might be good for real time too). They're all rigged and ready to export, organised into 4 folders showing the number of frames of animation they will export too: 32, 40 48 and 64 frames. The sizes are set to 256 x 256 but this is easy to change, simply set the size you want in the animation properties window and then hit auto fit to resize the animation.