SkelForm

SkelForm is a 2D skeletal animator for game projects. It is best suited to makers who want a free, open-source rigging tool and already work with layered PSD art. Its strongest draw is the combination of browser editing and game-focused animation; the need for a separate runtime and the project’s work-in-progress status are important trade-offs.

Overview

SkelForm focuses on skeletal animation, with a web editor that works without downloading the application. Desktop users also have Windows and Mac installers; the installation guide describes the downloaded editor as a portable program distributed without an installer. Linux is among the supported platforms.

The PSD workflow turns groups into bones and merges the layers within each group into a texture. This gives Photoshop users a route from layered art to an armature, but the PSD’s group structure shapes how that rig is built. The project is GPL-3.0 licensed, which will matter to users choosing open-source software. SkelForm and its documentation are works in progress, a caveat for teams that need settled guidance for production.

Key features

• Skeletal animation and rig controls: The feature set includes skeletal animation, inverse kinematics, styles, and mesh deformation. These tools suit character motion built around a rig, including deformation beyond simply moving rigid parts.
• PSD import: Group-to-bone and layer-to-texture conversion makes layered Photoshop artwork a useful starting point. Artists whose files are organized differently may need to account for that structure when preparing a rig.
• Exports and runtime: SkelForm lists sprite sheet and video exports, and runtime export is supported. To play SkelForm animations in a game, a runtime is needed; the site lists generic and engine runtimes, and the user guide includes instructions for pygame. That extra integration step makes it less self-contained than a tool whose animations can be used directly by a game without a runtime.
• Community support: Users can ask questions, suggest improvements, or report bugs in the Discord server or forums without an account. That offers a way to seek help, though the project’s work-in-progress documentation remains relevant for users who prefer established guidance.

Pricing

SkelForm is free and open-source: the Free and open-source plan costs nothing. There is no free trial because the software has a free plan. There are no paid tiers or seat and quota limits described in the plan, making it a straightforward fit for individuals and teams looking to avoid a software fee. The cost saving does not remove the runtime requirement for game use.

Platforms

SkelForm supports Linux, macOS, web, and Windows. The v0.8 release describes dedicated Windows and Mac installers, while the installation guide calls the downloaded editor portable and installer-free. Mobile development is inactive, with no direct mobile build process; the repository describes using the web version in a WebView wrapper instead.

Who it's for

SkelForm is a sensible fit for game makers who want rig-based 2D animation, especially those starting from grouped PSD artwork or working in pygame. The browser editor is useful for avoiding a download, and the open-source license suits users who prioritize software they can inspect and use under GPL-3.0. Teams that require mature documentation, a direct mobile build, or a game workflow without a separate runtime should look elsewhere.

Pros and cons

• Pros: Free and GPL-3.0 licensed, so there is no software price and the project is open source.
• Pros: PSD groups become bones and their layers form textures, connecting layered Photoshop art to rigging.
• Pros: A web editor works without a download, alongside Linux, macOS, and Windows support.
• Cons: Games need a runtime to run SkelForm animations, adding an integration dependency.
• Cons: The software and documentation are works in progress, which may not suit production teams seeking established guidance.
• Cons: Mobile development is inactive and there is no direct mobile build process.

Alternatives

Choose Effekseer if you want a free, open-source tool with Android and iOS support alongside desktop and web platforms. Rive may suit readers seeking a collaborative editor workflow: its free plan includes 3 collaborative files and 1 project, with Android and iOS support. LibreSprite is another free, open-source option, with Android support as well as Linux, macOS, and Windows.

Pixelpart is an alternative with a free Demo plan. SpineBones offers a free plan with a 300-frame timeline, playback up to 120 FPS, and WebM, PNG sequence, and sprite sheet exports, for macOS and Windows. Spriter has a free version with PNG and spritesheet animation and basic animation features, plus paid options. Keyframe.it offers four browser tools without an account or ads. Phluxel may fit Windows users seeking a free option for personal, non-commercial work, with limits including a watermark and 128×128 output.

Browse more options in 2D Game Animation Software, Game Animation Software, and 2D Character Animation Software.

Verdict

Choose SkelForm if you want a free, open-source 2D skeletal animator, particularly for turning grouped PSD art into game character rigs. Its browser editor and rigging features are compelling for that focused workflow. Look elsewhere if your project cannot accommodate a separate runtime, needs direct mobile builds, or depends on mature documentation.