- Added an option to set a [custom user-agent string](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#extractoruser-agent)
- Improved retry behavior for failed HTTP requests
- Improved `seiga` by providing better metadata and getting more than the latest 200 images
- Improved `tumblr` by adding support for [all post types](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#extractortumblrposts), scanning for [inline images](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#extractortumblrinline) and following [external links](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#extractortumblrexternal) ([#48](https://github.com/mikf/gallery-dl/issues/48))
- Fixed extraction issues for `hbrowse`, `khinsider` and `senmanga`
- Added support for `booru` popular lists (`danbooru`, `e621`, `konachan`, `yandere`, `3dbooru`)
- Added the `--cookies` command-line and [`cookies`](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#extractorcookies) config option to load additional cookies
- Added the `--filter` and `--chapter-filter` command-line options to select individual images or manga-chapters by their metadata using simple Python expressions ([#43](https://github.com/mikf/gallery-dl/issues/43))
- Added the [`verify`](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#downloaderhttpverify) config option to control certificate verification during file downloads
- Added config options to overwrite internally used API credentials ([API Tokens & IDs](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#api-tokens-ids))
- Added `-K` as a shortcut for `--list-keywords`
- Changed the `--images` and `--chapters` command-line options to `--range` and `--chapter-range`
- Changed keyword names for various modules to make them accessible by `--filter`. In general minus signs have been replaced with underscores (e.g. `gallery-id` -> `gallery_id`).
- Changed default filename formats for manga extractors to optionally use volume and title information
- Improved the downloader modules to use [`.part` files](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#downloaderpart) and support resuming incomplete downloads ([#29](https://github.com/mikf/gallery-dl/issues/29))
- Improved `deviantart` by distinguishing between users and groups ([#26](https://github.com/mikf/gallery-dl/issues/26)), always using HTTPS, and always downloading full-sized original images
- Improved `sankaku` by adding authentication support and fixing various other issues ([#44](https://github.com/mikf/gallery-dl/issues/44))
- Improved URL pattern for direct image links ([#30](https://github.com/mikf/gallery-dl/issues/30))
- Fixed an issue with `luscious` not getting original image URLs ([#33](https://github.com/mikf/gallery-dl/issues/33))
- Fixed various smaller issues for `batoto`, `hentai2read` ([#38](https://github.com/mikf/gallery-dl/issues/38)), `jaiminisbox`, `khinsider`, `kissmanga` ([#28](https://github.com/mikf/gallery-dl/issues/28), [#46](https://github.com/mikf/gallery-dl/issues/46)), `mangahere`, `pawoo`, `twitter`
- Added support for user authentication data from [`.netrc`](https://stackoverflow.com/tags/.netrc/info) files ([#22](https://github.com/mikf/gallery-dl/issues/22))
- Added a simple progress indicator for multiple URLs ([#19](https://github.com/mikf/gallery-dl/issues/19))
- Fixed an issue with `pixhost` where for an image inside an album it would always download the first image of that album ([#13](https://github.com/mikf/gallery-dl/issues/13))
- Fixed an issue with `imagefap.com` where incorrectly reported gallery sizes would cause the extractor to fail ([#9](https://github.com/mikf/gallery-dl/issues/9))