diff --git a/aggregator/aggregator.go b/aggregator/aggregator.go
index 698cf07..677bc19 100644
--- a/aggregator/aggregator.go
+++ b/aggregator/aggregator.go
@@ -4,7 +4,9 @@ import (
 	"encoding/json"
 	"os"
 	"sort"
+	"strings"
 
+	"github.com/mrusme/gobbs/models/forum"
 	"github.com/mrusme/gobbs/models/post"
 	"github.com/mrusme/gobbs/models/reply"
 	"github.com/mrusme/gobbs/ui/ctx"
@@ -21,6 +23,33 @@ func New(c *ctx.Ctx) (*Aggregator, error) {
 	return a, nil
 }
 
+func (a *Aggregator) ListForums() ([]forum.Forum, []error) {
+	var errs []error = make([]error, len(a.ctx.Systems))
+	var forums []forum.Forum
+
+	for idx, sys := range a.ctx.Systems {
+		if curSysIDX := a.ctx.GetCurrentSystem(); curSysIDX != -1 {
+			if idx != curSysIDX {
+				continue
+			}
+		}
+
+		sysForums, err := (*sys).ListForums()
+		if err != nil {
+			errs[idx] = err
+			continue
+		}
+		forums = append(forums, sysForums...)
+	}
+
+	sort.SliceStable(forums, func(i, j int) bool {
+		return strings.Compare(forums[i].Name, forums[j].Name) == 1
+	})
+
+	return forums, errs
+
+}
+
 func (a *Aggregator) ListPosts() ([]post.Post, []error) {
 	var errs []error = make([]error, len(a.ctx.Systems))
 	var posts []post.Post
@@ -37,7 +66,13 @@ func (a *Aggregator) ListPosts() ([]post.Post, []error) {
 	}
 
 	for idx, sys := range a.ctx.Systems {
-		sysPosts, err := (*sys).ListPosts()
+		if curSysIDX := a.ctx.GetCurrentSystem(); curSysIDX != -1 {
+			if idx != curSysIDX {
+				continue
+			}
+		}
+
+		sysPosts, err := (*sys).ListPosts(a.ctx.GetCurrentForum().ID)
 		if err != nil {
 			errs[idx] = err
 			continue
diff --git a/cmd/root.go b/cmd/root.go
index aae27d1..a3f4755 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -92,6 +92,7 @@ func loadSystems(c *ctx.Ctx) []error {
 		}
 
 		c.AddSystem(&sys)
+		c.Logger.Debugf("setting system ID to %d", c.NumSystems()-1)
 		sys.SetID(c.NumSystems() - 1)
 	}
 
diff --git a/models/forum/forum.go b/models/forum/forum.go
index 165d132..7e1d7e5 100644
--- a/models/forum/forum.go
+++ b/models/forum/forum.go
@@ -3,4 +3,18 @@ package forum
 type Forum struct {
 	ID   string
 	Name string
+
+	SysIDX int
+}
+
+func (forum Forum) FilterValue() string {
+	return forum.Name
+}
+
+func (forum Forum) Title() string {
+	return forum.Name
+}
+
+func (forum Forum) Description() string {
+	return forum.ID
 }
diff --git a/system/all/all.go b/system/all/all.go
index 159e226..f41f896 100644
--- a/system/all/all.go
+++ b/system/all/all.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 
+	"github.com/mrusme/gobbs/models/forum"
 	"github.com/mrusme/gobbs/models/post"
 	"github.com/mrusme/gobbs/models/reply"
 	"github.com/mrusme/gobbs/system/adapter"
@@ -65,7 +66,11 @@ func (sys *System) Connect(sysURL string) error {
 	return errors.New("This system can't be connected to")
 }
 
-func (sys *System) ListPosts() ([]post.Post, error) {
+func (sys *System) ListForums() ([]forum.Forum, error) {
+	return []forum.Forum{}, nil
+}
+
+func (sys *System) ListPosts(forumID string) ([]post.Post, error) {
 	return []post.Post{}, nil
 }
 
diff --git a/system/discourse/api/topics.go b/system/discourse/api/topics.go
index 202ad01..7b20ea2 100644
--- a/system/discourse/api/topics.go
+++ b/system/discourse/api/topics.go
@@ -2,6 +2,7 @@ package api
 
 import (
 	"context"
+	"fmt"
 	"net/http"
 )
 
@@ -82,6 +83,8 @@ type TopicsService interface {
 	) (*SingleTopicResponse, error)
 	ListLatest(
 		ctx context.Context,
+		categorySlug string,
+		categoryID int,
 	) (*LatestTopicsResponse, error)
 }
 
@@ -112,8 +115,15 @@ func (a *TopicServiceHandler) Show(
 // List
 func (a *TopicServiceHandler) ListLatest(
 	ctx context.Context,
+	categorySlug string,
+	categoryID int,
 ) (*LatestTopicsResponse, error) {
-	uri := "/latest.json"
+	var uri string
+	if categoryID == -1 {
+		uri = "/latest.json"
+	} else {
+		uri = fmt.Sprintf("/c/%s/%d.json", categorySlug, categoryID)
+	}
 
 	req, err := a.client.NewRequest(ctx, http.MethodGet, uri, nil)
 	if err != nil {
diff --git a/system/discourse/discourse.go b/system/discourse/discourse.go
index 6f86450..a5e4bab 100644
--- a/system/discourse/discourse.go
+++ b/system/discourse/discourse.go
@@ -115,13 +115,51 @@ func (sys *System) Load() error {
 	return nil
 }
 
-func (sys *System) ListPosts() ([]post.Post, error) {
+func (sys *System) ListForums() ([]forum.Forum, error) {
+	var models []forum.Forum
+
+	cats, err := sys.client.Categories.List(context.Background())
+	if err != nil {
+		return []forum.Forum{}, err
+	}
+
+	for _, cat := range cats.CategoryList.Categories {
+		models = append(models, forum.Forum{
+			ID:   strconv.Itoa(cat.ID),
+			Name: cat.Name,
+
+			SysIDX: sys.ID,
+		})
+	}
+
+	return models, nil
+}
+
+func (sys *System) ListPosts(forumID string) ([]post.Post, error) {
+	var catSlug string = ""
+	var catID int = -1
+	var err error
+
 	cats, err := sys.client.Categories.List(context.Background())
 	if err != nil {
 		return []post.Post{}, err
 	}
 
-	items, err := sys.client.Topics.ListLatest(context.Background())
+	if forumID != "" {
+		catID, err = strconv.Atoi(forumID)
+		if err != nil {
+			return []post.Post{}, err
+		}
+
+		for _, cat := range cats.CategoryList.Categories {
+			if cat.ID == catID {
+				catSlug = cat.Slug
+				break
+			}
+		}
+	}
+
+	items, err := sys.client.Topics.ListLatest(context.Background(), catSlug, catID)
 	if err != nil {
 		return []post.Post{}, err
 	}
@@ -181,6 +219,8 @@ func (sys *System) ListPosts() ([]post.Post, error) {
 			Forum: forum.Forum{
 				ID:   strconv.Itoa(i.CategoryID),
 				Name: forumName,
+
+				SysIDX: sys.ID,
 			},
 
 			SysIDX: sys.ID,
diff --git a/system/hackernews/hackernews.go b/system/hackernews/hackernews.go
index 293955a..6975c62 100644
--- a/system/hackernews/hackernews.go
+++ b/system/hackernews/hackernews.go
@@ -82,8 +82,59 @@ func (sys *System) Load() error {
 	return nil
 }
 
-func (sys *System) ListPosts() ([]post.Post, error) {
-	stories, err := sys.client.TopStories(context.Background())
+func (sys *System) ListForums() ([]forum.Forum, error) {
+	return []forum.Forum{
+		{
+			ID:     "top",
+			Name:   "Top HN Stories",
+			SysIDX: sys.ID,
+		},
+		{
+			ID:     "best",
+			Name:   "Best HN Stories",
+			SysIDX: sys.ID,
+		},
+		{
+			ID:     "new",
+			Name:   "New HN Stories",
+			SysIDX: sys.ID,
+		},
+		{
+			ID:     "ask",
+			Name:   "Ask HN",
+			SysIDX: sys.ID,
+		},
+		{
+			ID:     "show",
+			Name:   "Show HN",
+			SysIDX: sys.ID,
+		},
+		{
+			ID:     "jobs",
+			Name:   "Jobs HN",
+			SysIDX: sys.ID,
+		},
+	}, nil
+}
+
+func (sys *System) ListPosts(forumID string) ([]post.Post, error) {
+	var stories []int
+	var err error
+
+	switch forumID {
+	case "top":
+		stories, err = sys.client.TopStories(context.Background())
+	case "best":
+		stories, err = sys.client.BestStories(context.Background())
+	case "ask":
+		stories, err = sys.client.AskStories(context.Background())
+	case "show":
+		stories, err = sys.client.ShowStories(context.Background())
+	case "jobs":
+		stories, err = sys.client.JobStories(context.Background())
+	default:
+		stories, err = sys.client.NewStories(context.Background())
+	}
 	if err != nil {
 		return []post.Post{}, err
 	}
@@ -142,6 +193,8 @@ func (sys *System) ListPosts() ([]post.Post, error) {
 			Forum: forum.Forum{
 				ID:   "new",
 				Name: "New",
+
+				SysIDX: sys.ID,
 			},
 
 			Replies: replies,
diff --git a/system/lemmy/lemmy.go b/system/lemmy/lemmy.go
index 099952d..fd6f94e 100644
--- a/system/lemmy/lemmy.go
+++ b/system/lemmy/lemmy.go
@@ -2,6 +2,7 @@ package lemmy
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"net/url"
 	"strconv"
@@ -113,7 +114,31 @@ func (sys *System) Load() error {
 	return nil
 }
 
-func (sys *System) ListPosts() ([]post.Post, error) {
+func (sys *System) ListForums() ([]forum.Forum, error) {
+	resp, err := sys.client.Communities(context.Background(), types.ListCommunities{
+		Type: types.NewOptional(types.ListingSubscribed),
+	})
+	if err != nil {
+		return []forum.Forum{}, err
+	}
+
+	var models []forum.Forum
+	for _, i := range resp.Communities {
+		sys.logger.Debugf("FORUM:")
+		b, _ := json.Marshal(i)
+		sys.logger.Debug(string(b))
+		models = append(models, forum.Forum{
+			ID:   strconv.Itoa(i.CommunitySafe.ID),
+			Name: i.CommunitySafe.Name,
+
+			SysIDX: sys.ID,
+		})
+	}
+
+	return models, nil
+}
+
+func (sys *System) ListPosts(forumID string) ([]post.Post, error) {
 	resp, err := sys.client.Posts(context.Background(), types.GetPosts{
 		Type:  types.NewOptional(types.ListingSubscribed),
 		Sort:  types.NewOptional(types.New),
@@ -163,6 +188,8 @@ func (sys *System) ListPosts() ([]post.Post, error) {
 			Forum: forum.Forum{
 				ID:   strconv.Itoa(i.Post.CommunityID),
 				Name: i.Community.Name,
+
+				SysIDX: sys.ID,
 			},
 
 			SysIDX: sys.ID,
diff --git a/system/system.go b/system/system.go
index 5e0ae28..df01765 100644
--- a/system/system.go
+++ b/system/system.go
@@ -3,6 +3,7 @@ package system
 import (
 	"errors"
 
+	"github.com/mrusme/gobbs/models/forum"
 	"github.com/mrusme/gobbs/models/post"
 	"github.com/mrusme/gobbs/models/reply"
 	"github.com/mrusme/gobbs/system/adapter"
@@ -28,7 +29,8 @@ type System interface {
 	Connect(sysURL string) error
 	Load() error
 
-	ListPosts() ([]post.Post, error)
+	ListForums() ([]forum.Forum, error)
+	ListPosts(forumID string) ([]post.Post, error)
 	LoadPost(p *post.Post) error
 	CreatePost(p *post.Post) error
 	CreateReply(r *reply.Reply) error
diff --git a/ui/ctx/ctx.go b/ui/ctx/ctx.go
index f52b8b3..020487a 100644
--- a/ui/ctx/ctx.go
+++ b/ui/ctx/ctx.go
@@ -2,6 +2,7 @@ package ctx
 
 import (
 	"github.com/mrusme/gobbs/config"
+	"github.com/mrusme/gobbs/models/forum"
 	"github.com/mrusme/gobbs/system"
 	"github.com/mrusme/gobbs/ui/theme"
 	"go.uber.org/zap"
@@ -17,7 +18,7 @@ type Ctx struct {
 	Theme   *theme.Theme
 
 	currentSystem int
-	currentForum  string
+	currentForum  forum.Forum
 }
 
 func New(
@@ -33,7 +34,7 @@ func New(
 		Theme:   theme.New(cfg),
 
 		currentSystem: -1,
-		currentForum:  "",
+		currentForum:  forum.Forum{},
 	}
 }
 
@@ -54,10 +55,10 @@ func (c *Ctx) GetCurrentSystem() int {
 	return c.currentSystem
 }
 
-func (c *Ctx) SetCurrentForum(id string) {
-	c.currentForum = id
+func (c *Ctx) SetCurrentForum(f forum.Forum) {
+	c.currentForum = f
 }
 
-func (c *Ctx) GetCurrentForum() string {
+func (c *Ctx) GetCurrentForum() forum.Forum {
 	return c.currentForum
 }
diff --git a/ui/header/header.go b/ui/header/header.go
index 59eee92..e4546e6 100644
--- a/ui/header/header.go
+++ b/ui/header/header.go
@@ -77,8 +77,14 @@ func (m Model) View() string {
 		currentSystem = (*m.ctx.Systems[curSysIdx]).Title()
 	}
 
+	curForum := m.ctx.GetCurrentForum()
+	var currentForum string = "All"
+	if curForum.ID != "" {
+		currentForum = curForum.Title()
+	}
+
 	systemSelector := selector.Render(fmt.Sprintf("⏷  %s", currentSystem))
-	forumSelector := selector.Render("⏷  All")
+	forumSelector := selector.Render(fmt.Sprintf("⏷  %s", currentForum))
 
 	selectorColumn := lipgloss.JoinVertical(lipgloss.Center,
 		lipgloss.JoinHorizontal(lipgloss.Bottom, "System: \n   "+
diff --git a/ui/ui.go b/ui/ui.go
index bb4e38e..343e19e 100644
--- a/ui/ui.go
+++ b/ui/ui.go
@@ -5,6 +5,7 @@ import (
 
 	"strings"
 
+	"github.com/mrusme/gobbs/aggregator"
 	"github.com/mrusme/gobbs/models/forum"
 	"github.com/mrusme/gobbs/system"
 	"github.com/mrusme/gobbs/ui/cmd"
@@ -54,6 +55,8 @@ type Model struct {
 	wm          *windowmanager.WM
 	ctx         *ctx.Ctx
 
+	a *aggregator.Aggregator
+
 	viewcache         string
 	viewcacheID       string
 	renderOnlyFocused bool
@@ -73,6 +76,8 @@ func NewModel(c *ctx.Ctx) Model {
 	m.header = header.NewModel(m.ctx)
 	m.views = append(m.views, posts.NewModel(m.ctx))
 
+	m.a, _ = aggregator.New(m.ctx)
+
 	return m
 }
 
@@ -130,6 +135,39 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			)
 			return m, tea.Batch(ccmds...)
 
+		case key.Matches(msg, m.keymap.ForumSelect):
+			var listItems []list.Item
+
+			all := forum.Forum{ID: "", Name: "All", SysIDX: -1}
+			listItems = append(listItems, all)
+
+			forums, errs := m.a.ListForums()
+			if len(errs) > 0 {
+				// TODO: Handle errors
+			}
+			for _, f := range forums {
+				m.ctx.Logger.Debugf("Adding forum to list: %s ID %d\n", f.Title(), f.SysIDX)
+				listItems = append(listItems, f)
+			}
+
+			ccmds := m.wm.Open(
+				popuplist.WIN_ID,
+				popuplist.NewModel(m.ctx),
+				[4]int{
+					int(m.ctx.Content[1] / 2),
+					int(m.ctx.Content[1] / 4),
+					int(m.ctx.Content[1] / 2),
+					int(m.ctx.Content[1] / 4),
+				},
+				cmd.New(
+					cmd.WinOpen,
+					popuplist.WIN_ID,
+					cmd.Arg{Name: "selectionID", Value: "forum"},
+					cmd.Arg{Name: "items", Value: listItems},
+				),
+			)
+			return m, tea.Batch(ccmds...)
+
 		default:
 			if m.wm.GetNumberOpen() > 0 {
 				cmd := m.wm.Update(m.wm.Focused(), msg)
@@ -198,9 +236,12 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				case "system":
 					selected := msg.GetArg("selected").(system.System)
 					m.ctx.SetCurrentSystem(selected.GetID())
+					m.ctx.SetCurrentForum(forum.Forum{})
 				case "forum":
 					selected := msg.GetArg("selected").(forum.Forum)
-					m.ctx.SetCurrentForum(selected.ID)
+					m.ctx.Logger.Debugf("selecting system ID %d\n", selected.SysIDX)
+					m.ctx.SetCurrentSystem(selected.SysIDX)
+					m.ctx.SetCurrentForum(selected)
 				}
 			}