Feature list

incomplete, must be sorted by priority

Configurable dashboard and top menu.
Single-page, ajax-based, without page reloads in general.
Streams

Streams of object of the same type.
Define list of object values.
Sorting stream object by field values.
Pagination.
Pluggable actions for objects in the stream: edit, delete, preview, edit log, publishing, etc.
Pluggable actions for entire stream: ordering, etc.
Filtering a stream based on FilterForm.
Filtered by corresponding
Allowed to use all the widgets available for edit form (many of them are useless here, never mind).
Ability to define custom filtering conditions for fields in FieldForm.
Ability to define persistent query filter conditions for entire stream.
Manual ordering of objects in a stream, saved to database
Permissions system for accessing, creating, changing, deleting and publishing objects. Is extendable.
Loners: a stream for just a one item, without list view.
Edit

Editing an object in the stream
Autosave periodically and on page leave
Draft forms. If form does not validate, it is saved as draft. Next time user opens the objects edit page, he gets the form in the state (invalid) he leaved it, with errors displayed. But invalid state of object is not commited.
Item locks
Items are locked automatically for actions marked as lockable
Unable to edit item without lock ownership
Locks are browser tab-based, so editor can not be in editing conflict with himself even if he had opened same objects in two tabs
Show lock owner when attempting to access locked item,
Ability to force the lock
Highlight locked items in the stream
Before-delete warning with list of all items linking to current (having stream and accessible by the editor)
Forms

Representing, converting and validating objects by iktomi forms.
Extendable WYSIWYG editor. describe
Flexible HTML cleanup converter.
WYSIWYG buttons to display are chosen automatically on the base of converter allowed tags, when possible.
Widgets for selecting objects from another stream for sqlalchemy relationships.
Inline editing of item collections inside current object (sqlalchemy delete-orphan option). Depth of relationships to edit is not limited.
Ajax file upload. describe
Automated generation of scaled/cropped image versions
Describe image resizing rules and sizes by ImageResizer objects and their combinations.
Manual image cropping from the source image interface.
Scaled images are generated on Ajax upload, so preview and cropping is available immediately.
Default cropping rectangles are displayed on first upload.
Grouping values in field to collapsable FieldBlock-s.
Long-press character autocomplete in text inputs and WYSIWYG.
More editing features

Edit logging for an object (if edited is a stream).
Log edit, delete and publication actions, and others if implemented.
Save editor, date of edit, initial and resulting state of the form
Show field-based diff
Images are logged as thumbnails.
Precommit hooks, allows to postpone a commit, warn editor for some possibly wrong conditions, etc.
Warn if file upload is in progress.
Show linked items in different streams.
Pluggable editor notes widget for an item.
Trays (inboxes) for editors. An editor can send any object to another editor's tray.
Preview action. describe
Publication

Two-state based publishing system.
Base classes for creating sqlalchemy classes for editorial and published versions of objects.
Internationalized streams (with finite language count), internationalized publishing streams.
Language versions for an object can be with one-to-one item correspondence. If this option is on, object with same id are considered different language versions for the same item.
Base classes supporting single-table storage of language versions of the object, allowing to define common fields for all versions (for example, for Photo images can be common, and titles can be specific for each language).
Automated creation time and update time tracking.
Implementation details and minor features

Embedded sqlalchemy model factories for all provided features, that can be imported and initiated in the application.
Flashing messages from ajax request handlers throught cookies.
JS and CSS packer based on one or multiple Manifest files. Allows to combine files from iktomi-cms pack and app-specific user-defined ones.
What next?

Docs
Tests
Try to use react forms